Rock genre is a broad term that encompasses many different styles of music. METAL is a genre of rock music that is characterized by aggressive, distorted guitar riffs and heavy drumming. CLASSIC rock is a style of rock music that emerged in the mid-1960s and is rooted in blues and psychedelic rock. Emo is a style of rock music that is characterized by emotional lyrics and melodic instrumentation. Glam rock is a style of rock music that emerged in the 1970s and is characterized by theatrical costumes and makeup. PUNK rock is a style of rock music that emerged in the mid-1970s and is characterized by fast tempos, aggressive lyrics, and stripped-down instrumentation. Indie rock is a style of rock music that emerged in the 1980s and is characterized by an independent spirit and DIY attitude. ACID rock is a style of rock music that emerged in the late 1960s and is characterized by its use of electronic instruments and psychedelic soundscapes. MOD is a style of rock music that emerged in the 1960s and is characterized by its focus on fashion and style. COMEDY rock is a style of rock music that is characterized by humorous lyrics and lighthearted instrumentation.