bebop

or bop

Jazz characterized by harmonic complexity, convoluted melodic lines, and frequent shifting of rhythmic accent. In the mid-1940s, a group of musicians, including Dizzy Gillespie, Thelonious Monk, and Charlie Parker, rejected the conventions of swing to pioneer a self-consciously artistic extension of improvised jazz, which set new technical standards of velocity and harmonic subtlety. Two genres grew out of bebop in the 1950s: the delicate, dry, understated approach that came to be known as cool jazz, and the aggressive, blues-tinged earthiness of hard bop.

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