Green Day's Billie Joe Armstrong brings 10-year-old on stage at SF's Outside Lands

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Green Day frontman Billie Joe Armstrong wowed the crowd

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a local punk band brutally released

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the Outside Lands Music Festival in San Francisco on Saturday night.

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This continued to surprise, but because it was a 10-year-old kid.

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He shouted at the crowd that filled the entire polo arena

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“There are only three F-King chords.

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Armstrong watched the audience carefully.

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