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.
Art Pepper the 1950s Pepper was recognized as one of the leading alto saxophonists in jazz, finishing second only to Charlie Parker as Best Alto Saxophonist in the "DownBeat" magazine Readers Poll of 1952. Along with Chet Baker, Gerry Mulligan and Shelly Manne, and perhaps due more to geography than playing style, Pepper is often associated with the musical movement known as West Coast jazz, as contrasted with the East Coast (or "hot") jazz of Charlie Parker, Dizzy Gillespie and Miles Davis. Some of Pepper's most famous albums from the 1950s are "Art Pepper Meets the Rhythm Section", "Art Pepper + Eleven