Bebop emerged in the 1940s as a new style of jazz that was faster and more complex than previous styles. It developed during a recording ban that forced musicians to perform live. Key bebop musicians included Charlie Parker, Dizzy Gillespie, Thelonious Monk, and Miles Davis. Bebop was characterized by faster tempos, more complex rhythms, and melodies that featured unusual harmonies, leaps, and dissonances.