Dances to jazz include the bebop and bop styles. Bebop is a style of jazz characterized by fast tempos, improvisation, and complex harmonic structures. It was developed in the 1940s and is often considered the first modern jazz style. Bop, or bop-style jazz, is a style of jazz that emerged in the early 1940s and is characterized by its fast tempo, improvisation, and complex harmonic structures. It is often seen as a direct descendant of bebop.