How Paul McCartney Ended Up In A Nirvana Reunion

If it hadn’t been for Johnny Depp, Paul McCartney might never have won a Grammy for Best Rock Song with the surviving members of Nirvana.

That’s precisely what happened a little over a week ago at the 56th Annual Grammy Awards, when the former Beatle ended up onstage with Dave Grohl, Krist Novoselic and Pat Smear to accept the hardware for their collaboration, “Cut Me Some Slack.”

“I blame Johnny Depp,” McCartney explained to a group of reporters gathered at the Staples Center’s media room. “Be...