Definition of rock music is a genre of popular music that originated as “rock and roll” in 1950s America and developed into a range of different styles in the 1960s and later, particularly in the United Kingdom and the United States.
Musically, definition of rock musichas centered around the electric guitar, usually as part of a rock group with bass guitar and drums. Lyrics often stress romantic love but also address a wide variety of other themes that are frequently social or political in emphasis. The dominance of rock by white, male musicians has been seen as one of the key factors shaping the themes explored in rock music. Rock places a higher degree of emphasis on musicianship and live performance.