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Ratings started to tank, so one of the greatest sitcoms on TV came to a close after 10 years.

The TV version of season 2 used the theme from season 1, but the DVD replaces it with the seasons 3-10 due to licensing costs.

Syndicated versions from back when the show was still in first run were called Happy Days Again and seasons 1 and 2 used the original 1955 version of Rock Around the Clock.

The first 2 seasons of the show used a cover version of Rock Around the Clock by Bill Haley and the Comets.