Three surviving members of Nirvana sat in with Paul McCartney during his performance at Seattle’s Safeco Field on Friday night. Near the end of Sir Paul’s show in the city where their seminal grunge band formed, Nirvana drummer Dave Grohl, Nirvana bassist Krist Novoselic and touring Nirvana guitarist Pat Smear joined McCartney for a take on the new original song “Cut Me Some Slack.” The members of Nirvana remained onstage for a series of classics that included “Get Back,” The Beatles’ version of the Little Richard classic “Long Tall Sally,” “Helter Skelter,” “Golden Slumbers,” “Carry That Weight” and “The End.” “Cut Me Some Slack”“Helter Skelter”“Get Back”