The sound of rock often revolves around the guitar back beat laid down by a rhythm section of electric bass guitar, drums, and keyboard instruments such as organ, piano, or, since the 1970s, synthesizers. Along with the guitar or keyboards, saxophone and blues-style harmonica are sometimes used as soloing instruments. In its "purest form", it "has three chords, a strong, insistent back beat, and a catchy melody.
the earliest and most famous performers in the early days of rock music was Elvis Presley, who shocked the world with his suggestive dancing and powerful music. He became an instant phenomenon, and led the way for many other rock music performers o

THE BEATLES