Green Day's Billie Joe Armstrong joins London covers band in pub

What do you do when one of your childhood heroes joins you on-stage as you cover one of their songs?

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Green Day's Billie Joe Armstrong joins London covers band in pub

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Radio X on X: Billie Joe Armstrong of @GreenDay joins fan and

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Cover band stunned as Green Day's Billie Joe Armstrong joins

Green Day's Billie Joe Armstrong Joins Covers Band in London Pub

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Cover band stunned as Green Day's Billie Joe Armstrong joins