Crunk emerged in the early 1990s as a subgenre of hip hop music originating in the Southern United States. It combines hip hop music with electronic dance music and is characterized by up-tempo beats. Popular Crunk artists include Lil Jon & The Eastside Boyz and Ying Yang Twins. Deathcore is an extreme metal genre that combines the heavy riffs and vocals of death metal with the growling vocals and breakdowns of metalcore. It originated in the mid-1990s and bands in the genre like Suicide Silence have faced criticism from fans of other metal subgenres. Roots reggae developed in the 1970s and deals with everyday life and spirituality through artists like Bob Marley, Peter Tosh