Question: Included among chromatic button accordions is what chromatic button accordion developed in Russia in the early 20th century and named after the 11th-century bard Boyan?

full_context: Document 1: Bay Ganyo: Bay Ganyo (Bulgarian: Бай Ганьо , pronounced ] ; also transliterated as "Bai Ganio" or "Baj Ganjo") is a fictional character created by Bulgarian author Aleko Konstantinov (1863–1897). He is at present considered an exemplary image of an anti-hero: uneducated, ignorant, egoistic. Sometimes perceived as a stereotype of the uneducated, profit-driven Bulgarian and indeed the average Balkan person, he is often seen merely as a social stereotype, a member of the Principality of Bulgaria's newly formed lower middle-class.
Document 2: Schoenberg hexachord: 6-Z44 (012569), known as the Schoenberg hexachord, is Arnold Schoenberg's signature hexachord, as one transposition contains the pitches [A], Es, C, H, B, E, G (A. Schoenberg), E♭ , B, and B♭ being Es, H, and B in German.
Document 3: German Jubilate Harmonium Reeds: German Jubilate/Harmola/Monarch Harmonium Reeds are brass reeds used in Indian harmoniums that were manufactured in Germany between 1911 and the early 1960s. The Jubilate/Harmola/Monarch reeds were originally manufactured for American style suction reed organs being manufactured in Germany on machinery that was bought second hand in Chicago in the United States and imported to Germany by Karl Mannborg son of Theodor Mannborg. Mannborg owned the factory in Pegau, Germany supplying organ parts for American style suction reed organs. Germany was the only country in Europe that was manufacturing American style suction reed organs while the rest of the reed organ industry in Europe was making pressure reed Harmoniums.
Document 4: Khromka: Khromka (Russian: хро́мка , "khromka") is a type of Russian garmon (unisonoric diatonic button accordion). It is the most widespread variant in Russia and in the former USSR. Nearly all Russian garmons made since the mid of the 20th century are khromkas.
Document 5: Jankó keyboard: The Jankó keyboard is a musical keyboard layout for a piano designed by Paul von Jankó in 1882. It was designed to overcome two limitations on the traditional piano keyboard: the large-scale geometry of the keys (stretching beyond a ninth, or even an octave, can be difficult or impossible for pianists with small hands), and the fact that each scale has to be fingered differently. Instead of a single row, the Jankó keyboard has an array of keys consisting of two interlocking manuals with three touch-points for each key lever. Each vertical column of keys is a semitone away from its neighboring columns, and on each horizontal row of keys the interval from one note to the next is a whole step.
Document 6: Ram Narayan: Ram Narayan (Hindi: राम नारायण ; IAST: Rām Nārāyaṇ , ] ; born 25 December 1927), often referred to with the title Pandit, is an Indian musician who popularised the bowed instrument sarangi as a solo concert instrument in Hindustani classical music and became the first internationally successful sarangi player.
Document 7: B-Bender: B-Bender is a guitar accessory that enables a player to mechanically bend the B-string up a whole tone (two frets) to C-sharp. There are several different designs, but all use levers or pulleys inside or outside the guitar body that are activated by a pull or push of the guitar neck, body, or bridge. The resulting tone sounds much like a pedal steel guitar and contributes a "country" feeling. Originally designed for the Fender Telecaster, B-Benders are now available to fit many solid body electric guitars, and even acoustic guitars.
Document 8: Bassline: A bassline (also known as a bass line or bass part) is the term used in many styles of popular music, such as jazz, blues, funk, dub and electronic, or traditional music, for the low-pitched instrumental part or line played by a rhythm section instrument such as the electric bass, double bass, cello, tuba or keyboard (piano, Hammond organ, electric organ, or synthesizer). It is also used sometimes in classical music. In unaccompanied solo performance, basslines may simply be played in the lower register of any instrument such as guitar or piano while melody and/or further accompaniment is provided in the middle or upper register. In solo music for piano and pipe organ, these instruments have an excellent lower register that can be used to play a deep bassline. On organs, the bass line is typically played using the pedal keyboard and massive 16' and 32' bass pipes.
Document 9: Chromatic button accordion: A chromatic button accordion is a type of button accordion where the melody-side keyboard consists of rows of buttons arranged chromatically. The bass-side keyboard is usually the Stradella system or one of the various free-bass systems. Included among chromatic button accordions are the Russian bayan and Schrammel accordion. There can be 3 to 5 rows of vertical treble buttons. In a 5 row chromatic, two additional rows repeat the first 2 rows to facilitate options in fingering.
Document 10: Keyboard glockenspiel: The keyboard glockenspiel (French: "jeu de timbre") or organ glockenspiel is an instrument consisting of a glockenspiel operated by a piano keyboard. It was first used by George Frideric Handel in the oratorio "Saul" (1739). It was also used in the 1739 revivals of his "Il Trionfo del Tempo" and "Acis and Galatea", and the next year in "L'Allegro, il Penseroso ed il Moderato". Half a century later, Wolfgang Amadeus Mozart employed a "strumento d’acciaio" in "The Magic Flute" (1791) to represent Papageno's magic bells, and this instrument is believed to have been a keyboard glockenspiel. This part is nowadays sometimes taken by a celesta. Maurice Ravel preferred the keyboard version of the instrument because it can play a true ff dynamic for brilliance and iridescence in orchestral climaxes. In the late 20th century, the firm of Bergerault began manufacturing a three-octave (F2–E4) mallet instrument with a damping mechanism operated by a foot pedal, which is capable of dealing with the wide range called for in contemporary scores.
Document 11: Bayan (accordion): The bayan (Russian: бая́н ; ] ) is a type of chromatic button accordion developed in Russia in the early 20th century and named after the 11th-century bard Boyan.
Document 12: Sonny Brogan: Sonny (Patrick Joseph) Brogan (4 July 1906 – 1 January 1965) was an Irish accordion player from the 1930s to the 1960s, and was one of Ireland's most popular traditional musicians. He was one of the earliest advocates of the two-row B/C button accordion in traditional music, and popularised it the 1950s and 60s. He originally played on a single-keyed Hohner melodeon, and later the two-row Paolo Soprani (pictured) which he used until he died. Sonny's Paolo Soprani was one of the rarest, the grey model, made in 1948, when the company still made them by hand. Offaly-born button box player Paddy O'Brien currently has Sonny's accordion.
Document 13: Omnichord: The Omnichord is an electronic musical instrument introduced in 1981 by the Suzuki Musical Instrument Corporation. It typically features a touch plate, and buttons for major, minor, and 7th chords. The most basic method of playing the instrument is to press the chord buttons and swipe the touch plate with a finger or guitar pick in imitation of strumming a stringed instrument. Originally designed as an electronic autoharp substitute, the Omnichord has become popular as an individual instrument in its own right, due to its unique, chiming timbre and its value as a kitsch object.
Document 14: Croatian tamburica: Croatian tamburitza (tam•bu•rit•za) is a folk song played with a tambura (cousins with Russian balalaika and the Italian mandolin) and is accompanied with a dance. The origin is most commonly thought to be introduced from the Turks by way of Bosnia between the 14th and 16th century. Although, others believe that the tambura was introduced by the Persians. It was not until the 19th century that tamburitza gained popularity during several nationalist movements against the Austro-Hungarian Empire. Many societies such as Croatian, Slovak and Czech, used national folk songs and dance as an "expression of their national identity". During this time, the first Croatian tamburitza ensemble was created by Pajo Kolarić in 1847. Also, during early 20th century ethnomusicologist Professor Vinko Žganec, began to write down Croatian folk songs which in the past were not written, but passed down from generation to generation.
Document 15: Piano: The piano is an acoustic, stringed musical instrument invented in Italy by Bartolomeo Cristofori around the year 1700 (the exact year is uncertain), in which the strings are struck by hammers. It is played using a keyboard, which is a row of keys (small levers) that the performer presses down or strikes with the fingers and thumbs of both hands to cause the hammers to strike the strings. The word "piano" is a shortened form of "pianoforte", the Italian term for the early 1700s versions of the instrument, which in turn derives from "gravicembalo col piano e forte" and "fortepiano". The Italian musical terms "piano" and "forte" indicate "soft" and "loud" respectively, in this context referring to the variations in volume (i.e., loudness) produced in response to a pianist's touch or pressure on the keys: the greater the velocity of a key press, the greater the force of the hammer hitting the strings, and the louder the sound of the note produced and the stronger the attack. The first fortepianos in the 1700s had a quieter sound and smaller dynamic range.
ground_truth: bayan