Early Jazz Form is a term used to describe two distinct styles of jazz music that emerged in the 1940s. The first style, known as Rebop, was characterized by its fast tempo and improvisation. It was developed by musicians such as Dizzy Gillespie and Charlie Parker. The second style, known as BEBOP, was slower and more structured than Rebop. It was developed by musicians such as Thelonious Monk and Bud Powell. Both styles of jazz were influential in the development of modern jazz music.