 Even record companies would take their time putting their toes into the rock and roll pool. One of the first changes in the record world was in the 1950s. There was a transition from the 78 RPM record format to the 45 RPM, which really represented the pop recording. In 1958, the 45 disc replaced the 78 completely. The first time you'll hear the term top 40 is in 1960. Here, producer Snuff Garrett tell the story.