Happy Days was one of the most popular shows in the ’70’s and ’80’s. It starred Ron Howard (from The Andy Griffith Show), Henry Winkler, Marion Ross, Anson Williams, Donny Most, Erin Moran, and Tom Bosley when it started in 1974, and by the time the show ended, roughly 30 more actors were added to and subtracted from the cast. In the first two seasons, “Rock Around The Clock” by Bill Haley & His Comets was the show’s opening theme, and this song was the closing theme; starting with the third season, it served both as the opening and closing theme. It was written by Norman Gimbel and Charles Fox and sung by Truett Pratt and Jerry McClain for the first season, after which it was sung by Jim Haas. Pratt & McClain released it as a single in 1976, and it reached #5 on the Hot 100, #3 in Canada, and #31 in the UK.