rock 'n' roll /ˌrɒk ən ˈrəʊl $ ˌrɑːk ən ˈroʊl/ BrE AmE noun [uncountable]
1 . a style of music with a strong loud beat played on ↑ guitar s and drums, which first became popular in the 1950s:
Elvis, the king of rock ‘n’ roll
2 . something is the new rock 'n' roll 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?