At the end credits we can read
CHUCK LORRE PRODUCTIONS #587
If you were troubled that a Ramones cover song from 1993 was on the radio in the comic book store even though the show is set in 1989, I understand. Normally we would never do something like that, but the truth is I got excited by the lyrics "Someone told me long ago, there's a calm before the storm" and how they foreshadowed the tornado. I also liked the rebellious tone the Ramones set in a store that Mary felt inappropriate for Sheldon.
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If you're also wondering how a Joey Ramone cover from 2002 got in the end, I don't know... he's from Queens and so am I - what do you want from me?