“Rock & Roll: (noun) African American slang dating back to the early 20th Century. In the early 1950s, the term came to be used to describe a new form of music, steeped in the blues, rhythm & blues, country and gospel. Today, it refers to a wide variety of popular music — frequently music with an edge and attitude, music with a good beat and — often — loud guitars.”, Rock and Roll Hall of Fame and Museum.