• The rock sound often revolves around the electric guitar
or guitar and uses a strong backbeat set by the rhythm of
the electric bass, drums, keyboard, and other instruments
such as orga ad piano. Along with the guitar or keyboard,
the saxophone and the harmonica, are sometimes used as
solo instruments. In its "pure form", rock "has three
chords, a strong and insistent setback and a captivating
melody."
• Most rock bands consist of a vocalist, a guitarist, a bassist and a
drummer, forming a quartet.