Rock and Roll

Consequently music must have been in existence for at least 50,000 years and the first music must have been invented in Africa and then evolved to become a fundamental constituent of human life.

Rock-and-Roll (räk'n roll') n. first so used (1951) by Alan Freed, Cleveland disc jockey, taken from the song "My Baby Rocks Me with a Steady Roll". The use of rock, roll, rock and roll, etc., with reference to sexual intercourse, is traditional in blues, a form of popular music that evolved in the 1950's from rhythm and blues, characterized by the use of electric guitars, a strong rhythm with an accent on the offbeat, and youth-oriented lyrics.

A form of popular music arising from and incorporating a variety of musical styles, especially rhythm and blues, country music, and gospel. Originating in the United States in the 1950s, it is characterized by electronically amplified instrumentation, a heavily accented beat, and relatively simple phrase structure.