Watch The Grateful Dead’s Bob Weir & New England Patriots’ Rob Gronkowski Join Paul McCartney Onstage In Boston

The Grateful Dead’s Bob Weir and New England Patriots TE Rob Gronkowski joined Paul McCartney onstage last night at Boston’s Fenway Park. McCartney and Weir played Wings’ “Hi Hi Hi” and then the Beatles’ “Helter Skelter” for which Gronkowski joined on air guitar. Watch below.