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It was covered by Rabbitt on their 1975 album Boys Will Be Boys, by Italo-disco outfit Cat Gang in 1983, by W.A.S.P. on the reissue of their 1989 album The Headless Children (as a bonus track), Styx on their 2005 album Big Bang Theory, and Helloween on their 1999 album Metal Jukebox.
The memo also noted that the AP Stylebook calls for the usage of the phrase "Big Bang theory".