来源于《牛津现代高级英汉双解词典》1988年版，牛津大学出版社，p. 984.在这里面rock 和 rock'n'roll 是同义词。

其实好像在英文里，rock 和 rock'n‘roll意思也不全明确。

http://en.wikipedia.org/wiki/Rock_and_roll

“The term "rock and roll" now has at least two different meanings, both in common usage. The American Heritage Dictionary and the Merriam-Webster Dictionary both define rock and roll as synonymous with rock music. Allwords.com, however, refers specifically to the music of the 1950s.”