The vigor of the music notwithstanding, a revolt against the confining nature of the harmony, melody, and rhythm of swing arose in Kansas City and Harlem in the 1930s and reached fruition in the mid-40s. The new music, called "bebop" or "rebop" (later shortened to "bop"), was rejected at first by many critics. Bop was characterized by the flatted fifth, a more elaborate rhythmic structure, and a harmonic rather than melodic focus. Charlie Parker, Dizzy Gillespie, Thelonius Monk, Kenny Clarke, and Charlie Christian were major influences in the new music, which became the basis for modern jazz. The influence of two swing musicians, the tenor saxophonist Lester Young and the drummer Jo Jones, was of paramount importance in influencing the harmonic and rhythmic direction of bop.
The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.