rock 'n' roll [uncountable]
a style of music with a strong loud beat played on guitars and drums, which first became popular in the 1950s:
Elvis, the king of rock 'n' roll
2 British English
used to say that a particular activity has become very popular and fashionable and is being discussed a lot on television, in newspapers etc:
Hadn't Mark heard that cooking was the new rock 'n' roll?