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who sings the happy days theme song?

you know that song 'sunday monday happy days tuesday wednesday happy days thursday friday happys saturday what a day" and all that ... who sings that

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bill haley and the comets!
Bill Haley and His Comets
Potsie and Ralph Mouth.
Originally, it opened with Rock Around The Clock by Bill Halley and the Comets. Then it changed to Happy Days by Norman Gimbel and Charles Fox.
Norman Gimbel and Charles Fox.
IDoEverytimeTheShowComesOn
Jimmy Haas (lead vocal), Ron Hicklin, Stan Farber, Jerry Whitman and Gary Garrett (backing vocals), plus studio musicians. then in the final seaon Bobby Arvon on lead vocals, with several back-up vocalists Norman Gimbel and Charles Fox. were the writers
Google "Happy Days" Theme song - then go to Wikipedia - it has all the information you could ask for about "Happy Days"
http://uk.youtube.com/watch?v=yLt7clQbBzo I think it was some of the Cast Anson Williams appears to sing it in the credits
Norman Gimble and Charles Fox I did find this exert out of Wikipedia "Happy Days Are Here Again" is a song copyrighted in 1929 by Milton Ager (music) and Jack Yellen (lyrics). The song was recorded by Leo Reisman and His Orchestra, with Lou Levin, vocal (November 1929), and was used in the 1930 film Chasing Rainbows. Today, the song is probably best remembered as the campaign song for Franklin Delano Roosevelt's (FDR) successful 1932 Presidential campaign. Since FDR's use of the song, it has come to be recognized as the unofficial theme of the Democratic Party. The lyrics suggest optimism and buoyancy. Matthew Greenwald characterized it, "A true saloon standard, Happy Days Are Here Again is a Tin Pan Alley standard, and had been sung by virtually every interpreter since the 1940s. In a way, it's the pop version of Auld Lang Syne."[1] The song is #47 on the Recording Industry Association of America's list of "Songs of the Century". By 2006, 76 commercially released albums included versions of the song.[2]
alfonzo del rahomina
Pratt & McClain