Kenneth Clarke Spearman, known professionally as Kenny Clarke and nicknamed Klook, was an American jazz drummer and bandleader. A major innovator of the bebop style of drumming, he pioneered the use of the ride cymbal to keep time rather than the hi-hat, along with the use of the bass drum for irregular accents.

Bebop or bop is a style of jazz developed in the early to mid-1940s in the United States. The style features compositions characterized by a fast tempo, complex chord progressions with rapid chord changes and numerous changes of key, instrumental virtuosity, and improvisation based on a combination of harmonic structure, the use of scales and occasional references to the melody.