<Tr> <Td> "Whachersign" (1976) </Td> <Td> "Happy Days" (1976) </Td> <Td> "Devil with a Blue Dress On" (1976) </Td> </Tr> <P> "Happy Days" is a song written by Norman Gimbel and Charles Fox . It is the theme song of Happy Days . It can be heard during the TV show's opening and closing credits as it runs in perpetual rerun syndication . </P> <P> The song was first recorded in 1974 by Jim Haas with a group of other session singers for the first two seasons . These versions of the song were used only during the closing credits of Seasons 1 and 2, with an updated version of "Rock Around the Clock" by Bill Haley and His Comets used as the opening theme . The song was re-recorded in 1975 with different lyrics for both the opening and closing credits for Seasons 3 through 10 . Pratt & McClain released the song as a single in 1976 from their album Pratt & McClain Featuring Happy Days . Bobby Arvon recorded an updated version of the song in 1983 for the opening and closing credits of Season 11, with the same lyrics as the version used for seasons 3 - 10 . </P> <P> Pratt & McClain's album version of the song, recorded in 1976, peaked at No. 5 on the Billboard Hot 100, No. 7 on the Easy Listening chart, and No. 31 on the UK Singles Chart . In Canada, "Happy Days" reached No. 3 . </P>

When did the happy days theme song change
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