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Dr. John's Classic Rock Quiz

David Letterman poses for photographers during the 35th Kennedy Center Honors at the Kennedy Center Hall of States on December 2, 2012 in Washington, DC.
(Photo by Kris Connor/Getty Images)

The Late Show With David Letterman premiered 20 years ago this year.

Today's question:

Lock in your guess and make sure you check back tomorrow for the correct answer!

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