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
Horn in jazz incorporate the French horn into a jazz ensemble. In early 1940, the Claude Thornhill Orchestra had moved out to southern California. During this time, the Thornhill band was moving jazz in an entirely new direction, creating an entirely new sound. Thornhill's original band comprised twelve musicians, all playing traditionally "jazz" instruments. When Thornhill hired Bill Borden as an arranger, they created a group with a more orchestral style. Their new sound involved using instruments that were not typical to jazz and mixing unusual instrument voicing. Around the same time, Julius Watkins joined a six-member jazz band playing horn. Watkins had