 At the same time British audiences were beginning to encounter American rock and roll, initially through films including "Blackboard Jungle" (1955) and "Rock Around the Clock" (1956).Both movies contained the Bill Haley & His Comets hit "Rock Around the Clock", which first entered the British charts in early 1955 – four months before it reached the US pop charts – topped the British charts later that year and again in 1956, and helped identify rock and roll with teenage delinquency.American rock and roll acts such as Elvis Presley, Little Richard, Buddy Holly, Chuck Berry and Carl Perkins thereafter became major forces in the British charts.