Alternative rock is a genre of music that emerged in the 1980s and is characterized by its eclectic mix of styles. It includes subgenres such as progressive rock, ARENA rock, GRUNGE, PUNK, emo, METAL, and glam. Progressive rock is a style of rock music that combines elements of classical music with rock, while ARENA rock is a style of rock music that is designed to be played in large stadiums. GRUNGE is a style of rock music that originated in Seattle in the late 1980s and is characterized by its heavy sound and distorted guitars. PUNK is a style of rock music that originated in the 1970s and is characterized by its fast tempo and aggressive lyrics. Emo is a style of rock music that originated in the 1990s and is characterized by its emotional lyrics and melodic sound. METAL is a style of rock music that originated in the 1970s and is characterized by its heavy sound and distorted guitars. Glam rock is a style of rock music that originated in the 1970s and is characterized by its theatrical costumes and makeup.