In 1951, Cleveland, Ohio, disc jockey Alan Freed began playing rhythm and blues music for a multi-racial audience, and is credited with first using the phrase "rock and roll" to describe the musical sound of the Doo-wop vocal groups and the rockabilly singers who emerged in the 1950s. The Four Lads, from Toronto, were one of the first groups to capitalize on this sound and become a prominent act in the Canadian rhythm and blues scene, producing their first hit in 1952 called "Mocking Bird". Their most famous hit was "Moments to Remember", which first reached the "Billboard" magazine charts on September 3, 1955. Emerging in the mid-1950s, on near equal-footing to American popular music, Canadian popular music enjoyed considerable success at home and abroad.