Miami bass (booty music or booty bass) is a subgenre of hip hop music that became popular in the 1980s and 1990s. Its roots are directly linked to the electro-funk sound of the early 1980s. The use of the Roland TR-808 sustained kick drum, raised dance tempos, and frequently sexually explicit lyrical content differentiate it from other hip hop subgenres. Music author Richie Unterberger has characterized Miami bass as using rhythms with a "stop start flavor" and "hissy" cymbals with lyrics that "reflected the language of the streets, particularly Miami's historically black neighborhoods such as Liberty City and Overtown".