Contrasts (Sz.
 111, BB 116) is a 1938 composition scored for clarinet-violin-piano trio by Béla Bartók (1881–1945).
 It is based on Hungarian and Romanian dance melodies and has three movements with a combined duration of 17–20 minutes.
 Bartók wrote the work in response to a letter from violinist Joseph Szigeti, although it was officially commissioned by clarinetist Benny Goodman.
The term lead instrument carries a variety of connotations.
 A lead instrument could be a reference to an instrument that plays the melody of a piece, an instrument that has been designed for this purpose, such as clarinet or violin, or a specific member of an orchestra that is featured as the most proficient musician of the group.
 In digital music composition, lead may refer to the tone quality that is applied to a signal.
Appalachian Spring is a composition by Aaron Copland that premiered in 1944 and has achieved widespread and enduring popularity as an orchestral suite.
 The ballet, scored for a thirteen-member chamber orchestra, was created upon commission of choreographer and dancer Martha Graham with funds from the Coolidge Foundation.
 It premiered on Monday, 30 October 1944 at the Library of Congress in Washington DC, with Martha Graham dancing the lead role.
 The set was designed by the American sculptor Isamu Noguchi.
 Copland was awarded the 1945 Pulitzer Prize for Music for his achievement.
The Piano Quartet No. 2 in A major, Op.
 26, by Johannes Brahms is a musical composition scored for piano, violin, viola and cello.
 It was completed in 1861 and received its premiere in November 1863 by the Hellmesberger Quartet with the composer playing the piano part.
 It has been especially noted for drawing influence from composer Franz Schubert.
 Lasting approximately 50 minutes, this quartet is the longest of Brahms's chamber works to perform.
"I'm in the Mood" is a 1993 song by the musician CeCe Peniston, released as the first commercial single taken from "Thought 'Ya Knew", the singer's second studio album.
 The composition scored singer her fourth number one on the "Billboard" Hot Dance Music/Club Play chart, and also entered the Top 10 of the US R&B chart, peaking at number 7.
 On the Hot 100 the song peaked at number 32 and made number 16 on the UK Top 75.
 In a 2011 interview for "Boy Culture", TypePad's bloging service, Peniston disclosed that she had actually expected a better reception of the single.
"Hope That We Can Be Together Soon is a song written by Kenneth Gamble and Leon Huff that was originally recorded by Dusty Springfield as "Let's Get Together Soon" and was included in her 1970 album "A Brand New Me" (which was also produced by Gamble and Huff).
 The composition scored a hit when it was released by Sharon Paige and Harold Melvin & the Blue Notes in 1975.
 Released in 1975 from the album "To Be True", it reached #1 on the Hot Soul Singles chart in the summer of that year.
 It reached #42 on the "Billboard" Hot 100.
 Unlike most of the group's singles from this time period, Melvin handles most of the vocal duties, while Teddy Pendergrass appears for one line and the closing part of the song.
 Paige would later take on a more prominent role in the group after Pendergrass left the group for a solo career.
Connotations is a classical music composition for symphony orchestra written by American composer Aaron Copland.
 Commissioned by Leonard Bernstein in 1962 to commemorate the opening of Philharmonic Hall (now David Geffen Hall at Lincoln Center for the Performing Arts) in New York City, United States, this piece marks a departure from Copland's populist period, which began with "El Salón México" in 1936 and includes the works he is most famous for such as "Appalachian Spring", "Lincoln Portrait" and "Rodeo".
 It represents a return to a more dissonant style of composition in which Copland wrote from the end of his studies with French pedagogue Nadia Boulanger and return from Europe in 1924 until the Great Depression.
 It was also Copland's first dodecaphonic work for orchestra, a style he had disparaged until he heard the music of French composer Pierre Boulez and adapted the method for himself in his "Piano Quartet" of 1950.
 While the composer had produced other orchestral works contemporary to "Connotations", it was his first purely symphonic work since his Third Symphony, written in 1947.
EXPO is an orchestral composition by the Finnish composer Magnus Lindberg.
 It was the first work commissioned by the New York Philharmonic under the conductor Alan Gilbert, and was Lindberg's first commission as the orchestra's composer-in-residence.
 The piece was first performed on September 16, 2009 at Avery Fisher Hall, New York City, during Alan Gilbert's inaugural concert with the New York Philharmonic.
 "EXPO" was the first newly commissioned work to open the New York Philharmonic's concert season since the premiere of Aaron Copland's "Connotations" under Leonard Bernstein on September 23, 1962.
An Oboe quartet is a composition scored for oboe, violin, viola and basso.
 While the genre is not very common, Mozart wrote the most well known, his Oboe Quartet, K. 370.
 Other composers of oboe quartets include Johann Christian Bach, Josef Fiala, Franz Krommer and Colin Matthews.
 The oboe quartet form is often less preferable to composers than the standard string quartet, as indicated by the few compositions for this ensemble.
Musical composition can refer to an original piece of music, either a song or an instrumental music piece, the structure of a musical piece, or the process of creating or writing a new song or piece of music.
 People who create new compositions are called composers in classical music.
 In popular music and traditional music, the creators of new songs are usually called songwriters; with songs, the person who writes new words for a song is the lyricist.
 "Composition" is the act or practice of creating a song or other piece of music.
 In many cultures, including Western classical music, the act of composing typically includes the creation of music notation, such as a sheet music "score", which is then performed by the composer or by other instrumental musicians or singers.
 In popular music and traditional music, songwriting may involve the creation of a basic outline of the song, called the lead sheet, which sets out the melody, lyrics and chord progression.
 In classical music, orchestration (choosing the instruments of a large music ensemble such as an orchestra which will play the different parts of music, such as the melody, accompaniment, countermelody, bassline and so on) is typically done by the composer, but in musical theatre and in pop music, songwriters may hire an arranger to do the orchestration.
 In some cases, a pop or traditional songwriter may not use written notation at all, and instead compose the song in her mind and then play, sing and/or record it from memory.
 In jazz and popular music, notable sound recordings by influential performers are given the weight that written or printed scores play in classical music.

Question: Connotations is a piece that includes the composition scored for what orchestra?
Answer: thirteen-member chamber orchestra