Jazz standard and Billy Strayhorn's "Take the 'A' Train" (1941). With the big bands struggling to keep going during World War II, a shift was happening in jazz in favor of smaller groups. Some swing era musicians, such as Louis Jordan, later found popularity in a new kind of music, called "rhythm and blues", that would evolve into rock and roll in the 1950s. Bebop emerged in the early 1940s, with Charlie Parker, Dizzy Gillespie and Thelonious Monk leading the way. It appealed to a more specialized audiences than earlier forms of jazz, with sophisticated harmonies, fast tempos and often virtuoso musicianship.
Miles Davis tried to persuade him to join the Tiny Bradshaw band, which was passing through town, but his mother insisted he finish high school before going on tour. He said later, "I didn't talk to her for two weeks. And I didn't go with the band either." In January 1944, Davis finished high school and graduated in absentia in June. During the next month, his girlfriend gave birth to a daughter, Cheryl. In July 1944, Billy Eckstine visited St. Louis with a band that included Art Blakey, Dizzy Gillespie, and Charlie Parker. Trumpeter Buddy Anderson was too sick to perform, so