By 1940 the big band sound had grown stale, and jazz musicians began to search out new sounds and styles. At the Harlem nightclub Minton's Playhouse, a small group of musicians -- John Birks, Dizzy Gillespie, Coleman Beau Hawkins, and Thelonious Monk, among sounding blend of flatted fifths, unfamiliar chord lines, and accelerated offbeat rhythms. They were joined on 52nd Street by alto saxist Charles Bird Parker, and bop -- or bebop, as it was first...