Josephine (Josie) Bond Hebron (November 22, 1894 - February 1982) was an avid traveler, business woman, author/publisher and an African-American pioneer.
 She was the cousin of the African-American composer and pianist Carl Rossini Diton and sister of the African-American composer and pianist John Harvey Hebron, Marian Anderson’s accompanist and piano teacher.
Will Vodery (October 8, 1885 - November 18, 1951) was an African-American composer, conductor, orchestrator, and arranger, and one of the few black Americans of his time to make a name for himself as a composer on Broadway, working largely for Florenz Ziegfeld.
Scott Joplin ( ; 1867/68 or November 24, 1868– April 1, 1917) was an African-American composer and pianist.
 Joplin achieved fame for his ragtime compositions and was dubbed the "King of Ragtime".
 During his brief career, he wrote 44 original ragtime pieces, one ragtime ballet, and two operas.
 One of his first, and most popular pieces, the "Maple Leaf Rag", became ragtime's first and most influential hit, and has been recognized as the rag.
Thomas Million John Turpin (November 18, 1871 – August 13, 1922) was an African-American composer of ragtime music.
Lilacs for voice and orchestra (or Lilacs) is a musical composition by George T. Walker, Jr. (born 1922) that was awarded the 1996 Pulitzer Prize for Music.
 The work, scored for soprano soloist and orchestra, was the unanimous choice of the Pulitzer prize jury.
 Walker was the first African-American composer to be awarded the prize.
Undine Eliza Anna Smith Moore (25 August 1904 – 6 February 1989) was a notable and prolific African-American composer of the 20th century.
 She was also a professor emeritus at Virginia State University.
 Moore wrote more than 100 compositions, although only about 26 of these were published in her lifetime.
 Much of her work was composed for choir or voice and many of these were inspired by black spirituals and folk music.
 Moore once said that she was "a teacher who composes, rather than a composer who teaches."
Air Lore is an album by the improvisational trio Air featuring Henry Threadgill, Steve McCall, and Fred Hopkins performing compositions by Jelly Roll Morton and Scott Joplin.
 It was reissued on compact disc by Bluebird/RCA in 1987 and included in the eight-CD box set, "Complete Novus and Columbia Recordings of Henry Threadgill and Air" on Mosaic Records.
Julius Penson Williams born June 22, 1954 in The Bronx, New York, is an African-American composer, conductor, and college professor.
Kurt Farquhar is a Los Angeles based–television and film composer.
 Farquhar is a seven-time BMI award winner, including four for "The King of Queens".
 one for The Game and two for Being Mary Jane.
 He is best known for composing the scores for "The King of Queens", "Girlfriends", "Sister, Sister", "Moesha", "Being Mary Jane", "The Game", "Black Lightning", and "Real Husbands of Hollywood".
 Farquhar's career is notable for having scored more primetime television series than any other African-American composer to date.
William Mercer Cook (January 27, 1869 – July 19, 1944), better known as Will Marion Cook, was an African-American composer and violinist from the United States.
 Cook was a student of Antonín Dvořák and performed for King George V among others.
 He is probably best known for his popular songs and Broadway musicals, such as "" and "In Dahomey".

Question: Which African-American composer co-wrote Air?
Answer: Scott Joplin