Broad musical genre typically featuring electric guitar, drums, and powerful bass. Lyrics may be shouted as much as sung, and are often on themes of rebellion against sexual, societal and political repression. Early form known as rock and roll considered to date from the 1955 hit, "Rock Around the Clock" by Bill Haley and His Comets, but the term had been heard on records by black artists as early as the 1930s. Numerous subgenres exist, including folk-rock, classic rock, alternative, heavy metal, and punk. Related style, pop, considered less likely to carry an undercurrent of danger or rebellion. Related style of dance characterized by stronger reliance on bass, drums and keyboard, and usually has a much less prominent guitar part.