Put on your dancing shoes and move to the music.Rock and roll sprang from a combination of African-American genres， Western swing， and country music that exploded in post World War II America. Jim O'Connor explains what constitutes rock music， follows its history and sub-genres through famous musicians and groups， and shows how rock became so much more than just a style of music influencing fashion， language， and lifestyle.This entry in the New York Times best-selling series contains eighty illustrations and sixteen pages of black and white photographs.