Earlier this week, the Foo Fighters were joined onstage by rock icon Joan Jett during the encore of their show at Madison Square Garden. Last night on the Late Show with David Letterman, Jett and the Foos reunited to reprise their performance of Jett's classic "Bad Reputation." It's a pretty straightforward run through the tune, though Foo frontman Dave Grohl takes a spirited turn at the mic about halfway through.
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