a type of jazz with complicated rhythms Culture Bebop was especially popular in the 1940s and 1950s. It emphasizes the creative playing of individual musicians in small groups. Famous players include 'Dizzy'Gillespie, Charlie 'Bird'Parker and Thelonious Monk. The music again became popular in the 1990s because of musicians like the trumpet player Wynton Marsalis. Word Origin 1940s (originally US): imitative of the typical rhythm of this music.