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Rob Gronkowski joins Paul McCartney on stage at Fenway Park
0:47 | Extra Mustard
Rob Gronkowski joins Paul McCartney on stage at Fenway Park
Monday July 18th, 2016

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Rob Gronkowski is a singing and dancing machine, but you already knew that. Paul McCartney apparently knew that, too.

The rock legend invited the part-time partying legend on stage at Fenway Park Sunday night to perform "Helter Skelter." It was magical.

That is one phenomenal air guitar.

- Kenny Ducey

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