musically, rock mostly uses the electric guitar as part of a rock group with bass guitar and drums. rock music is song based. it has a 4/4 beat and it has verse-chorus form. however, rock has become very different and it is hard to say what its common musical instruments are. like popular music, rock music lyrics are mostly about "romantic love". they can also have social or have political themes, however. rock focuses on musical skill, live performance, and it tries to be more real than pop music.