sentence: Rock music is song-based.
sentences_before: Musically, rock mostly uses the electric guitar as part of a rock group with bass guitar and drums.
sentences_after: However, rock has become very different and it is hard to say what its common musical instruments are. They can also have social or have political themes, however. Nearly all rock musicians are white, male people. Rock focuses on musical skill, live performance, and it tries to be more real than pop music.
concept_name: rock music
headings: Rock music