Time signature - wikipedia Time signature `` Common time '' redirects here. For the short story, see Common Time. For the album, see Commontime ( album ). `` Time ( music ) '' redirects here. For other uses, see Half - time ( music ). An example of a time signature. The time signature indicates that there are three quarter notes ( crotchets ) per measure ( bar ). The time signature ( also known as meter signature, metre signature, or measure signature ) is a notational convention used in Western musical notation to specify how many beats ( pulses ) are to be contained in each measure ( bar ) and which note value is equivalent to one beat. In a music score, the time signature appears at the beginning, as a time symbol or stacked numerals, such as or ( read common time and three - four time, respectively ), immediately following the key signature or immediately following the clef symbol if the key signature is empty. A mid-score time signature, usually immediately following a barline, indicates a change of meter. There are various types of time signatures, depending on whether the music follows simple rhythms or involves unusual shifting tempos, including : simple ( such as or ), compound ( e.g., or ), complex ( e.g., or ), mixed ( e.g., & or & ), additive ( e.g., ), fractional ( e.g., ), and irrational meters ( e.g., or ). Contents 1 Frequently - used time signatures 1.1 Simple vs. compound 1.1. 1 Simple 1.1. 2 Compound 1.1. 3 Examples 1.2 Duple, triple, etc. 1.3 Beating time signatures 1.4 Characteristics 2 Complex time signatures 3 Mixed meters 4 Additive meters 5 Irrational meters 6 Variants 7 Early music usage 7.1 Mensural time signatures 7.2 Proportions 8 See also 9 References Frequently - used time signatures Basic time signatures :, also known as common time ( ) ;, alla breve, also known as cut time or cut - common time ( ) ; ; ; and Simple vs. compound Simple Simple time signatures consist of two numerals, one stacked above the other : The lower numeral indicates the note value that represents one beat ( the beat unit ). The upper numeral indicates how many such beats constitute a bar. For instance, means two quarter - note ( crotchet ) beats per bar, while means three eighth - note ( quaver ) beats per bar. The most common simple time signatures are,, and. By convention, two special symbols are sometimes used for and : The symbol is sometimes used for time, also called common time or imperfect time. The symbol is derived from a broken circle used in music notation from the 14th through 16th centuries, where a full circle represented what today would be written in or time, and was called tempus perfectum ( perfect time ). See Mensural time signatures below. The symbol is also a carry - over from the notational practice of late - Medieval and Renaissance music, where it signified tempus imperfectum diminutum ( diminished imperfect time ) -- more precisely, a doubling of the speed, or proportio dupla, in duple meter. In modern notation, it is used in place of and is called alla breve or, colloquially, cut time or cut common time. Compound In compound meter, subdivisions ( which are what the upper number represents in these meters ) of the beat are in three equal parts, so that a dotted note ( half again longer than a regular note ) becomes the beat. The upper numeral of compound time signatures is commonly 3, 6, 9, or 12 ( multiples of 3 in each beat ). The lower number is most commonly an 8 ( an eighth - note or quaver ) : as in or. Examples In the examples below, bold denotes a stressed beat, while italics denotes a less - stressed beat. Simple : The meter is a simple time signature that represents three quarter notes ( crotchets ). It is felt as : one and two and three and... Compound : In principle, comprises not three groups of two eighth notes ( quavers ) but two groups of three eighth - note ( quaver ) subdivisions. It is felt as : one two three four five six... These examples assume, for simplicity, that continuous eighth notes are the prevailing note values. The rhythm of actual music is typically not as regular. Duple, triple, etc Time signatures indicating two beats per bar ( whether in simple or compound meter ) are called duple meter, while those with three beats to the bar are triple meter. Terms such as quadruple ( 4 ), quintuple ( 5 ), and so on, are also occasionally used. Beating time signatures To the ear, a bar may seem like one singular beat. For example, a fast waltz, notated in time, may be described as being one in a bar. Correspondingly, at slow tempos, the beat indicated by the time signature could in actual performance be divided into smaller units. On a formal mathematical level, the time signatures of, e.g., and are interchangeable. In a sense, all simple triple time signatures, such as,,, etc. -- and all compound duple times, such as, and so on, are equivalent. A piece in can be easily rewritten in, simply by halving the length of the notes. equals time at a different tempo Play ( help info ) Other time signature rewritings are possible : most commonly a simple time signature with triplets translates into a compound meter. equals time at a different tempo and requires the use of tuplets Play ( help info ) Though formally interchangeable, for a composer or performing musician, by convention, different time signatures often have different connotations. First, a smaller note value in the beat unit implies a more complex notation, which can affect ease of performance. Second, beaming affects the choice of actual beat divisions. It is, for example, more natural to use the quarter note / crotchet as a beat unit in or than the eight / quaver in or. Third, time signatures are traditionally associated with different music styles -- it might seem strange to notate a rock tune in or. Characteristics The table below shows the characteristics of the most frequently - used time signatures. Simple time signatures or ( quadruple ) Common time : Widely used in most forms of Western popular music. Most common time signature in rock, blues, country, funk, and pop Simple quadruple drum pattern : divides each of four beats into two Play ( help info ) Simple duple drum pattern ( notated as ) : divides each of two beats into two Play ( help info ) or ( duple ) Alla breve, cut time : Used for marches and fast orchestral music. Frequently occurs in musical theater. The same effect is sometimes obtained by marking a meter `` in 2 '' ( duple ) Used for polkas, galops, and marches Simple duple drum pattern : divides each of two beats into two ( triple ) Used for waltzes, minuets, scherzi, polonaises, mazurkas, country & western ballads, R&B, sometimes used in pop Simple triple drum pattern : divides each of three beats into two Play ( help info ) ( triple ) Also used for the above but usually suggests higher tempo or shorter hypermeter Compound time signatures ( duple ) Double jigs, polkas, sega, salegy, tarantella, marches, barcarolles, loures, and some rock music Compound duple drum pattern : divides each of two beats into three Play ( help info ) ( triple ) Compound triple time : Used in triple ( `` slip '' ) jigs, otherwise occurring rarely ( `` The Ride of the Valkyries '', Tchaikovsky 's Fourth Symphony, and the final movement of J.S. Bach 's Violin Concerto in A minor ( BWV 1041 ) are familiar examples. Debussy 's `` Clair de lune '' and the opening bars of Prélude à l'après - midi d'un faune are also in ) Compound triple drum pattern : divides each of three beats into three Play ( help info ) ( quadruple ) Also common in slower blues ( where it is called a shuffle ) and doo - wop ; also used more recently in rock music. Can also be heard in some jigs like `` The Irish Washerwoman ''. This is also the time signature of the second movement of Beethoven 's Pastoral Symphony. Compound quadruple drum pattern : divides each of four beats into three Play ( help info ) Some video samples are shown below. Play media at a tempo of 60 bpm Play media at a tempo of 60 bpm Play media at a tempo of 60 bpm Play media at tempo of 30 bpm Play media at tempo of 30 bpm Play media at tempo of 30 bpm Complex time signatures See also : List of musical works in unusual time signatures, Quintuple meter, and Septuple meter Time Drum Beat Problems playing this file ? See media help. Signatures that do not fit the usual duple or triple categories are called complex, asymmetric, irregular, unusual, or odd -- though these are broad terms, and usually a more specific description is appropriate. The term odd meter, however, sometimes describes time signatures in which the upper number is simply odd rather than even, including and. The irregular meters ( not fitting duple or triple categories ) are common in some non-Western music, but rarely appeared in formal written Western music until the 19th century. Early anomalous examples appeared in Spain between 1516 and 1520, but the Delphic Hymns to Apollo ( one by Athenaeus is entirely in quintuple meter, the other by Limenius predominantly so ), carved on the exterior walls of the Athenian Treasury at Delphi in 128 BC are in the relatively common cretic meter, with five beats to a foot. The third movement of Frédéric Chopin 's Piano Sonata No. 1 ( 1828 ) is an early, but by no means the earliest, example of time in solo piano music. Anton Reicha 's Fugue No. 20 from his Thirty - six Fugues, published in 1803, is also for piano and is in. The waltz - like second movement of Tchaikovsky 's Pathétique Symphony, often described as a `` limping waltz '', is a notable example of time in orchestral music. Examples from 20th - century classical music include : Gustav Holst 's `` Mars, the Bringer of War '' and `` Neptune, the Mystic '' from The Planets ( both in ) Paul Hindemith 's `` Fuga secunda '' in G from Ludus Tonalis ( ) the ending of Stravinsky 's The Firebird ( ) the fugue from Heitor Villa - Lobos 's Bachianas Brasileiras No. 9 ( ) the themes for the Mission Impossible television series by Lalo Schifrin ( in ) and for Room 222 by Jerry Goldsmith ( in ) In the Western popular music tradition, unusual time signatures occur as well, with progressive rock in particular making frequent use of them. The use of shifting meters in The Beatles ' `` Strawberry Fields Forever '' and the use of quintuple meter in their `` Within You, Without You '' are well - known examples, as is Radiohead 's `` Paranoid Android '' ( includes ). Paul Desmond 's jazz composition `` Take Five '', in time, was one of a number of irregular - meter compositions that The Dave Brubeck Quartet played. They played other compositions in ( `` Eleven Four '' ), ( `` Unsquare Dance '' ), and ( `` Blue Rondo à la Turk '' ), expressed as. This last is an example of a work in a signature that, despite appearing merely compound triple, is actually more complex. Brubeck 's title refers to the characteristic aksak meter of the Turkish karşılama dance. However, such time signatures are only unusual in most Western music. Traditional music of the Balkans uses such meters extensively. Bulgarian dances, for example, include forms with 5, 7, 9, 11, 13, 15, 22, 25 and other numbers of beats per measure. These rhythms are notated as additive rhythms based on simple units, usually 2, 3 and 4 beats, though the notation fails to describe the metric `` time bending '' taking place, or compound meters. See Additive meters below. Some video samples are shown below. Play media at 60 bpm Play media at 60 bpm Play media at 60 bpm Mixed meters While time signatures usually express a regular pattern of beat stresses continuing through a piece ( or at least a section ), sometimes composers place a different time signature at the beginning of each bar, resulting in music with an extremely irregular rhythmic feel. In this case, the time signatures are an aid to the performers and not necessarily an indication of meter. The Promenade from Modest Mussorgsky 's Pictures at an Exhibition ( 1874 ) is a good example : Promenade from Pictures at an Exhibition Play ( help info ) Igor Stravinsky 's The Rite of Spring ( 1913 ) is famous for its `` savage '' rhythms : In such cases, a convention that some composers follow ( e.g., Olivier Messiaen, in his La Nativité du Seigneur and Quatuor pour la fin du temps ) is to simply omit the time signature. Charles Ives 's Concord Sonata has measure bars for select passages, but the majority of the work is unbarred. Some pieces have no time signature, as there is no discernible meter. This is sometimes known as free time. Sometimes one is provided ( usually ) so that the performer finds the piece easier to read, and simply has ' free time ' written as a direction. Sometimes the word FREE is written downwards on the staff to indicate the piece is in free time. Erik Satie wrote many compositions that are ostensibly in free time but actually follow an unstated and unchanging simple time signature. Later composers used this device more effectively, writing music almost devoid of a discernibly regular pulse. If two time signatures alternate repeatedly, sometimes the two signatures are placed together at the beginning of the piece or section, as shown below : Detail of score of Tchaikovsky 's String Quartet No. 2 in F major, showing a multiple time signature Additive meters To indicate more complex patterns of stresses, such as additive rhythms, more complex time signatures can be used. Additive meters have a pattern of beats that subdivide into smaller, irregular groups. Such meters are sometimes called imperfect, in contrast to perfect meters, in which the bar is first divided into equal units. For example, the time signature means that there are 8 quaver beats in the bar, divided as the first of a group of three eighth notes ( quavers ) that are stressed, then the first of a group of two, then first of a group of three again. The stress pattern is usually counted as : one two three one two one two three... This kind of time signature is commonly used to notate folk and non-Western types of music. In classical music, Béla Bartók and Olivier Messiaen have used such time signatures in their works. The first movement of Maurice Ravel 's Piano Trio in A Minor is written in, in which the beats are likewise subdivided into 3 + 2 + 3 to reflect Basque dance rhythms. Romanian musicologist Constantin Brăiloiu had a special interest in compound time signatures, developed while studying the traditional music of certain regions in his country. While investigating the origins of such unusual meters, he learned that they were even more characteristic of the traditional music of neighboring peoples ( e.g., the Bulgarians ). He suggested that such timings can be regarded as compounds of simple two - beat and three - beat meters, where an accent falls on every first beat, even though, for example in Bulgarian music, beat lengths of 1, 2, 3, 4 are used in the metric description. In addition, when focused only on stressed beats, simple time signatures can count as beats in a slower, compound time. However, there are two different - length beats in this resulting compound time, a one half - again longer than the short beat ( or conversely, the short beat is ​ ⁄ the value of the long ). This type of meter is called aksak ( the Turkish word for `` limping '' ), impeded, jolting, or shaking, and is described as an irregular bichronic rhythm. A certain amount of confusion for Western musicians is inevitable, since a measure they would likely regard as, for example, is a three - beat measure in aksak, with one long and two short beats ( with subdivisions of 2 + 2 + 3, 2 + 3 + 2, or 3 + 2 + 2 ). Folk music may make use of metric time bends, so that the proportions of the performed metric beat time lengths differ from the exact proportions indicated by the metric. Depending on playing style of the same meter, the time bend can vary from non-existent to considerable ; in the latter case, some musicologists may want to assign a different meter. For example, the Bulgarian tune `` Eleno Mome '' is written in one of three forms : ( 1 ) 7 = 2 + 2 + 1 + 2, ( 2 ) 13 = 4 + 4 + 2 + 3, or ( 3 ) 12 = 3 + 4 + 2 + 3, but an actual performance ( e.g., Smithsonian Eleno Mome ) may be closer to 4 + 4 + 2 + 3. The Macedonian 3 + 2 + 2 + 3 + 2 meter is even more complicated, with heavier time bends, and use of quadruples on the threes. The metric beat time proportions may vary with the speed that the tune is played. The Swedish Boda Polska ( Polska from the parish Boda ) has a typical elongated second beat. In Western classical music, metric time bend is used in the performance of the Viennese Waltz. Most Western music uses metric ratios of 2 : 1, 3 : 1, or 4 : 1 ( two -, three - or four - beat time signatures ) -- in other words, integer ratios that make all beats equal in time length. So, relative to that, 3 : 2 and 4 : 3 ratios correspond to very distinctive metric rhythm profiles. Complex accentuation occurs in Western music, but as syncopation rather than as part of the metric accentuation. Brăiloiu borrowed a term from Turkish medieval music theory : aksak. Such compound time signatures fall under the `` aksak rhythm '' category that he introduced along with a couple more that should describe the rhythm figures in traditional music. The term Brăiloiu revived had moderate success worldwide, but in Eastern Europe it is still frequently used. However, aksak rhythm figures occur not only in a few European countries, but on all continents, featuring various combinations of the two and three sequences. The longest are in Bulgaria. The shortest aksak rhythm figures follow the five - beat timing, comprising a two and a three ( or three and two ). Some video samples are shown below. Play media Time signature 3 + 2 + 3 at 120 beat divisions per minute Play media Rhythm of Dave Brubeck 's `` Blue Rondo à la Turk '' -- consists of three measures of 2 + 2 + 2 + 3 followed by one measure of 3 + 3 + 3 and the cycle then repeats. Taking the smallest time unit as eighth notes, the arrows on the tempo dial show the tempi for ♪, ♩, ♩. and the measure beat. Starts slow, speeds up to usual tempo Irrational meters Example of an irrational time signature : here there are four ( 4 ) third notes ( 3 ) per measure. A `` third note '' would be one third of a whole note, and thus is a half - note triplet. The second measure of presents the same notes, so the time signature serves to indicate the precise speed relationship between the notes in the two measures. These are time signatures, used for so - called irrational bar lengths, that have a denominator that is not a power of two ( 1, 2, 4, 8, 16, 32, etc. ). These are based on beats expressed in terms of fractions of full beats in the prevailing tempo -- for example or. For example, where implies a bar construction of four quarter - parts of a whole note ( i.e., four quarter notes ), implies a bar construction of four third - parts of it. These signatures are only of utility when juxtaposed with other signatures with varying denominators ; a piece written entirely in, say, could be more legibly written out in. The same example written using metric modulation instead of irrational time signatures. Three half notes in the first measure ( making up a dotted whole note ) are equal in duration to two half notes in the second ( making up a whole note ). The same example written using a change in time signature. Metric modulation is `` a somewhat distant analogy ''. It is arguable whether the use of these signatures makes metric relationships clearer or more obscure to the musician ; it is always possible to write a passage using non-irrational signatures by specifying a relationship between some note length in the previous bar and some other in the succeeding one. Sometimes, successive metric relationships between bars are so convoluted that the pure use of irrational signatures would quickly render the notation extremely hard to penetrate. Good examples, written entirely in conventional signatures with the aid of between - bar specified metric relationships, occur a number of times in John Adams ' opera Nixon in China ( 1987 ), where the sole use of irrational signatures would quickly produce massive numerators and denominators. Historically, this device has been prefigured wherever composers wrote tuplets. For example, a bar of 3 triplet crotchets could arguably be written as a bar of. Henry Cowell 's piano piece Fabric ( 1920 ) employs separate divisions of the bar ( anything from 1 to 9 ) for the three contrapuntal parts, using a scheme of shaped noteheads to visually clarify the differences, but the pioneering of these signatures is largely due to Brian Ferneyhough, who says that he finds that `` such ' irrational ' measures serve as a useful buffer between local changes of event density and actual changes of base tempo ''. Thomas Adès has also used them extensively -- for example in Traced Overhead ( 1996 ), the second movement of which contains, among more conventional meters, bars in such signatures as, and. A gradual process of diffusion into less rarefied musical circles seems underway. For example, John Pickard 's Eden, commissioned for the 2005 finals of the National Brass Band Championships of Great Britain contains bars of and. Notationally, rather than using Cowell 's elaborate series of notehead shapes, the same convention has been invoked as when normal tuplets are written ; for example, one beat in is written as a normal quarter note, four quarter notes complete the bar, but the whole bar lasts only ​ ⁄ of a reference whole note, and a beat ​ ⁄ of one ( or ​ ⁄ of a normal quarter note ). This is notated in exactly the same way that one would write if one were writing the first four quarter notes of five quintuplet quarter notes. This article uses irrational in the music theory sense, not the mathematical sense, where an irrational number is one that can not be written as a ratio of whole numbers. However, a few pieces from Conlon Nancarrow 's Studies for Player Piano use a time signature that is irrational in the mathematical sense. A piece contains a canon with a part augmented in the ratio √ 42 : 1 ( approximately 6.48 : 1 ). Another one has a time signature of, amongst others. Some video samples are shown below. These video samples show two time signatures combined to make a polymeter, since, say, in isolation, is identical to. Play media Polymeter and played together has three beats of to four beats of Play media Polymeter and played together has six beats of to four beats of Play media Polymeter and played together has five beats of to three beats of. The displayed numbers count the underlying polyrhythm, which is 5 : 3 Variants Some composers have used fractional beats : for example, the time signature appears in Carlos Chávez 's Piano Sonata No. 3 ( 1928 ) IV, m. 1. Example of Orff 's time signatures Music educator Carl Orff proposed replacing the lower number of the time signature with an actual note image, as shown at right. This system eliminates the need for compound time signatures, which are confusing to beginners. While this notation has not been adopted by music publishers generally ( except in Orff 's own compositions ), it is used extensively in music education textbooks. Similarly, American composers George Crumb and Joseph Schwantner, among others, have used this system in many of their works. Another possibility is to extend the barline where a time change is to take place above the top instrument 's line in a score and to write the time signature there, and there only, saving the ink and effort that would have been spent writing it in each instrument 's staff. Henryk Górecki 's Beatus Vir is an example of this. Alternatively, music in a large score sometimes has time signatures written as very long, thin numbers covering the whole height of the score rather than replicating it on each staff ; this is an aid to the conductor, who can see signature changes more easily. Early music usage Mensural time signatures In the 14th, 15th and 16th centuries, a period in which mensural notation was used, four basic mensuration signs determined the proportion between the two main units of rhythm. There were no measure or bar lines in music of this period ; these signs, the ancestors of modern time signatures, indicate the ratio of duration between different note values. The relation between the breve and the semibreve was called tempus, and the relation between the semibreve and the minim was called prolatio. The breve and the semibreve use roughly the same symbols as our modern double whole note ( breve ) and whole note ( semibreve ), but they were not limited to the same proportional values as are in use today. There are complicated rules concerning how a breve is sometimes three and sometimes two semibreves. Unlike modern notation, the duration ratios between these different values was not always 2 : 1 ; it could be either 2 : 1 or 3 : 1, and that is what, amongst other things, these mensuration signs indicated. A ratio of 3 : 1 was called complete, perhaps a reference to the Trinity, and a ratio of 2 : 1 was called incomplete. A circle used as a mensuration sign indicated tempus perfectum ( a circle being a symbol of completeness ), while an incomplete circle, resembling a letter C, indicated tempus imperfectum. Assuming the breve is a beat, this corresponds to the modern concepts of triple meter and duple meter, respectively. In either case, a dot in the center indicated prolatio perfecta ( compound meter ) while the absence of such a dot indicated prolatio imperfecta ( simple meter ). A rough equivalence of these signs to modern meters would be : corresponds to meter ; corresponds to meter ; corresponds to meter ; corresponds to meter. N.B. : in modern compound meters the beat is a dotted note value, such as a dotted quarter, because the ratios of the modern note value hierarchy are always 2 : 1. Dotted notes were never used in this way in the mensural period ; the main beat unit was always a simple ( undotted ) note value. Proportions Another set of signs in mensural notation specified the metric proportions of one section to another, similar to a metric modulation. A few common signs are shown : tempus imperfectum diminutum, 1 : 2 proportion ( twice as fast ) ; tempus perfectum diminutum, 1 : 2 proportion ( twice as fast ) ; or just proportio tripla, 1 : 3 proportion ( three times as fast, similar to triplets ). Often the ratio was expressed as two numbers, one above the other, looking similar to a modern time signature, though it could have values such as, which a conventional time signature could not. Some proportional signs were not used consistently from one place or century to another. In addition, certain composers delighted in creating `` puzzle '' compositions that were intentionally difficult to decipher. In particular, when the sign was encountered, the tactus ( beat ) changed from the usual semibreve to the breve, a circumstance called alla breve. This term has been sustained to the present day, and though now it means the beat is a minim ( half note ), in contradiction to the literal meaning of the phrase, it still indicates that the beat has changed to a longer note value. See also Schaffel Tala References Jump up ^ Alexander R. Brinkman, Pascal Programming for Music Research ( Chicago : University of Chicago Press, 1990 ) : 443, 450 -- 63, 757, 759, 767. ISBN 0226075079 ; Mary Elizabeth Clark and David Carr Glover, Piano Theory : Primer Level ( Miami : Belwin Mills, 1967 ) : 12 ; Steven M. Demorest, Building Choral Excellence : Teaching Sight - Singing in the Choral Rehearsal ( Oxford and New York : Oxford University Press, 2003 ) : 66. ISBN 0195165500 ; William Duckworth, A Creative Approach to Music Fundamentals, eleventh edition ( Boston, MA : Schirmer Cengage Learning, 2013 ) : 54, 59, 379. ISBN 0840029993 ; Edwin Gordon, Tonal and Rhythm Patterns : An Objective Analysis : A Taxonomy of Tonal Patterns and Rhythm Patterns and Seminal Experimental Evidence of Their Difficulty and Growth Rate ( Albany : SUNY Press, 1976 ) : 36 -- 37, 54 -- 55, 57. ISBN 0873953541 ; Demar Irvine, Reinhard G. Pauly, Mark A. Radice, Irvine 's Writing about Music, third edition ( Portland, Oregon : Amadeus Press, 1999 ) : 209 -- 10. ISBN 1574670492. Jump up ^ Henry Cowell and David Nicholls, New Musical Resources, third edition ( Cambridge and New York : Cambridge University Press, 1996 ) : 63. ISBN 0521496519 ( cloth ) ; ISBN 0521499747 ( pbk ) ; Cynthia M. Gessele, `` Thiéme, Frédéric ( Thieme, Friedrich ) '', The New Grove Dictionary of Music and Musicians, second edition, edited by Stanley Sadie and John Tyrrell ( London : Macmillan Publishers, 2001 ) ; James L. Zychowicz, Mahler 's Fourth Symphony ( Oxford and New York : Oxford University Press, 2005 ) : 82 -- 83, 107. ISBN 0195181654. Jump up ^ Edwin Gordon, Rhythm : Contrasting the Implications of Audiation and Notation ( Chicago : GIA Publications, 2000 ) : 111. ISBN 1579990983. Jump up ^ G. Augustus Holmes ( 1949 ). The Academic Manual of the Rudiments of Music. London : A. Weekes ; Stainer & Bell. p. 17. ISBN 9780852492765. Jump up ^ Willi Apel, The Notation of Polyphonic Music 900 -- 1600, fifth edition, revised and with commentary ; The Medieval Academy of America Publication no. 38 ( Cambridge, Massachusetts : The Medieval Academy of America, 1953 ) : 147 -- 48. Jump up ^ Scott Schroedl, Play Drums Today ! A Complete Guide to the Basics : Level One ( Milwaukee : Hal Leonard Corporation, 2001 ), p. 42. ISBN 0 - 634 - 02185 - 0. Jump up ^ See File : Bach BVW 1041 Allegro Assai. png for an excerpt from the violin part of the final movement. ^ Jump up to : Tim Emmons, Odd Meter Bass : Playing Odd Time Signatures Made Easy ( Van Nuys : Alfred Publishing, 2008 ) : 4. ISBN 978 - 0 - 7390 - 4081 - 2. `` What is an ' odd meter ' ?... A complete definition would begin with the idea of music organized in repeating rhythmic groups of three, five, seven, nine, eleven, thirteen, fifteen, etc. '' Jump up ^ Egert Pöhlmann and Martin L. West, Documents of Ancient Greek Music : The Extant Melodies and Fragments, edited and transcribed with commentary by Egert Pöhlmann and Martin L. West ( Oxford : Clarendon Press, 2001 ) : 70 -- 71, 85. ISBN 0 - 19 - 815223 - X. Jump up ^ `` Tchaikovsky 's Symphony # 6 ( Pathetique ), Classical Classics, Peter Gutmann ''. Classical Notes. Retrieved 2012 - 04 - 20. Jump up ^ Edward Macan, Rocking the Classics : English Progressive Rock and the Counterculture ( New York : Oxford University Press, 1997 ) : 48. ISBN 978 - 0 - 19 - 509888 - 4. Jump up ^ Radiohead ( musical group ). OK Computer, vocal score with guitar accompaniment and tablature ( Essex, England : IMP International Music Publications ; Miami, FL : Warner Bros. Publications ; Van Nuys, Calif. : Alfred Music Co., Inc., 1997 ) :. ISBN 0 - 7579 - 9166 - 1. Jump up ^ Manuel, Peter ( 1988 ). Popular Musics of the Non-Western World : An Introductory Survey ( rev. ed. ). Oxford University Press. p. 131. ISBN 9780195063349. Jump up ^ Gardner Read, Music Notation : A Manual of Modern Practice ( Boston : Allyn and Bacon, Inc., 1964 ) : Jump up ^ Constantin Brăiloiu, Le rythme Aksak, Revue de Musicologie 33, nos. 99 and 100 ( December 1951 ) : 71 -- 108. Citation on pp. 75 -- 76. Jump up ^ Gheorghe Oprea, Folclorul muzical românesc ( Bucharest : Ed. Muzicala, 2002 ), ISBN 973 - 42 - 0304 - 5 ^ Jump up to : `` Brian Ferneyhough '', The Ensemble Sospeso Jump up ^ John Pickard : Eden, full score, Kirklees Music, 2005. Jump up ^ Willi Apel, The Notation of Polyphonic Music 900 -- 1600, fifth edition, revised with commentary ; The Medieval Academy of America Publication no. 38 ( Cambridge, Massachusetts : The Mediaeval Academy of America, 1953 ), p. 148. Jump up ^ Willi Apel, The Notation of Polyphonic Music 900 -- 1600, fifth edition, revised with commentary ; The Medieval Academy of America Publication no. 38 ( Cambridge, Massachusetts : The Mediaeval Academy of America, 1953 ), p. 147. 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Question: what does a time signature mean in music
Answer: a notational convention used in Western musical notation to specify how many beats (pulses) are to be contained in each measure (bar) and which note value is equivalent to one beat