The effect was produced by rotating the brush fan on top of a calfskin drum head. Batteries started to become more and more complex. Drums developed further as a long line of percussionists of all stripes demanded certain configurations suited to their styles. In the 1930s, one of the first great drum players, Gene Krupa of the Benny Goodman Orchestra, abandoned the gear kit and opted for a four-piece kit with a bass and snare drum, a small tom mounted on the bass drum , and a larger one on the floor, completed by a hi-hat and ride, splash and crash cymbals: the drums in their modern incarnation. This configuration allowed Krupa to become a brilliant soloist. Modern drumming is what allowed musicians like Max Roach to play polyrhythms at racing tempos and, in the 1940s, to develop a new and very complex jazz language: bebop. They began using the ride cymbal to delineate time in an oscillating manner, and this pattern is still the basic rhythmic unit of