"Rock and Roll" was coined by the late Alan Freed.Freed was a radio disc jockey whom came to NYC from Cleveland in the early 1950's.He used the term Rock and Roll for the upbeat music he spun by artists like Chuck Berry,Bo Diddley,Little Richard Laverne Baker.The slower group harmony sound was called Rhythm and Blues later to be known as Do-wop ie The Harptones,Clovers,5 Keys,Moonglows.It was the first time youth had its own music and not that of its elders.Naturally it was looked upon as being rebellious and a Communist threat.