1. Bebop differed from swing by using smaller bands; richer chords; more chord changes; drier, more biting tone qualities; faster playing with more surprises.
2. The originators of bebop were alto saxophonist Charlie Parker, trumpeter Dizzy Gillespie, and pianist Thelonious Monk.
3. Parker wrote numerous tunes based on the accompaniment harmonies for popular songs and twelve-bar blues. These became standard repertory for generations of jazz musicians.
4. Gillespie devised an unorthodox trumpet style and led a string of outstanding combos and big bands.
5. Monk played piano in a very spare manner that was filled with unusual rhythms and harmonies. He wrote tunes that were difficult because of their odd accents and (unusual) chord progressions.
6. The ideas of Art Tatum, Charlie Parker, and Dizzy Gillespie appeared in the piano style of Bud Powell. Powell was widely imitated, and he significantly altered jazz piano style by reducing the activity of the left hand (or increasing the activity of the right hand).
7. Bebop drummers differed from swing drummers by increasing the frequency and spontaneity of kicks and prods, feathering the bass drum instead of pounding it, playing timekeeping rhythms on a suspended cymbal (ride cymbal), ad snapping the hi-hat shut sharply on the second and fourth beats.
8. Bebop styles and their offshoots were less popular than swing styles because they used fewer popular tunes and singers. They also relied less on arrangements. Solos and accompaniments were more complicated. Consequently, there was less predictability in the music.