Rock music of Canada the 1920s, rock and roll did not acquire its name until the 1950s. "Rock"' or its forerunners electric blues (Chicago blues) and rhythm and blues (Jump blues) was first heard in the late 1940s by Canadians who were living close enough to the American border to tune into American radio station broadcasts. 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 History of Rock and Roll Rolling Stone magazine not only released a book with this phrase ("The Rolling Stone Illustrated History of Rock & Roll"), but also had an early-1980s weekly radio series with some similarities to the classic 1978 special ("Rolling Stone's Continuous History of Rock & Roll"). The award-winning 1978 version of the show opened with a quick reverse "Time Sweep", featuring clips from selected songs from the 1970s backwards to the 1950s. It covered the 1950s, 1960s, and 1970s, and closed with a "A Top Ten of Rock & Roll" followed by the "Ending Time Sweep": The "time sweep" is a 53-minute