UP Jazz is a genre of jazz music that originated in the 1940s and 1950s. It is characterized by its fast tempo, improvisation, and complex harmonic structure. The two most prominent figures in UP Jazz are Ella Fitzgerald and Dizzy Gillespie, who are often credited with popularizing the genre. Ella Fitzgerald was an American jazz singer and songwriter known for her scat singing and improvisational skills. BOP, or bebop, is a style of jazz characterized by fast tempos, improvisation, and complex harmonic structures. It was developed by musicians such as Dizzy Gillespie and Charlie Parker in the 1940s.