K-pop is a form of popular music originating in South Korea. The music genre that the term is used to refer to colloquially emerged in the 1990s as a form of youth subculture, with Korean musicians influenced by Western dance music, hip-hop, R&B and rock. Today, K-pop commonly refers to the musical output of teen idol acts, chiefly girl groups and boy bands, who emphasize visual appeal and performance. As a pop genre, K-pop is characterized by its melodic quality and cultural hybridity.