Dizzy Gillespie Gillespie left Eckstine's band because he wanted to play with a small combo. A "small combo" typically comprised no more than five musicians, playing the trumpet, saxophone, piano, bass and drums. Bebop was known as the first modern jazz style. However, it was unpopular in the beginning and was not viewed as positively as swing music was. Bebop was seen as an outgrowth of swing, not a revolution. Swing introduced a diversity of new musicians in the bebop era like Charlie Parker, Thelonious Monk, Bud Powell, Kenny Clarke, Oscar Pettiford, and Gillespie. Through these musicians, a new vocabulary of musical
Jazz trombone driving force of this stylistic movement was J.J. Johnson, who is considered by some to be one of the most important figures in jazz trombone history. He followed the influences of bebop jazz innovators Charlie Parker and Dizzy Gillespie while adding his own, smooth, slower form of playing over the fast tracks of bebop. Typically when playing jazz music, it is preferred to be played on a standard small or medium bore tenor trombone with no extra attachments, as it will give the brightest sound and is more comfortable to play for longer periods of time in the extreme ranges