Crunk is a subgenre of hip hop music that emerged in the early 1990s and gained mainstream success during the mid 2000s. Performers of crunk music are sometimes referred to as "crunkmeisters". Crunk is often up-tempo and one of Southern hip hop's more dance and club oriented subgenres. An archetypal crunk track frequently uses a main groove consisting of layered keyboard synths, a drum machine rhythm, heavy basslines, and shouting vocals, often in a call and response manner. The term "crunk" is also used as a blanket term to denote any style of Southern hip hop, a side effect of the genre's breakthrough to the mainstream. The word derives from its African-American slang past-participle form, "crunk", of the verb "to crank" (as in the phrase "crank up").