Rock royalty Grohl, McCartney, and Springsteen

It started this morning, London time, when UK tabloid The Sun leaked word of an epic reunion: Remaining Nirvana members Krist Novoselic, Dave Grohl, and touring guitarist Pat Smear would play tonight's 12-12-12 concert at Madison Square Garden to benefit victims of Hurricane Sandy. And Sir Paul McCartney would stand in for the late Kurt Cobain—a shiny Beatle front man for Seattle's grunge heroes.

Now that the rumor mill's going, Spin magazine got a publicist from Nasty Little Man, which represents McCartney and Grohl, to "neither confirm nor deny" the superstar pairing tonight. And there are all kinds of other whispers: that Sir Paul called up Grohl, who in turn invited the Beatle to come "jam with some mates." (Would Grohl ever use the word "mate"?) Or that the Beatle couldn't pick the members of Nirvana out of a lineup. ("I didn't really know who they were," he allegedly told The Sun.)

Regardless, I'd tune in to watch a monkey front Nirvana tonight, given the rest of the concert's lineup: Bruce Springsteen and the E Street Band opens at 7:30e/4:30p, with Bon Jovi, Eric Clapton, Billy Joel, Alicia Keys, Chris Martin, the Rolling Stones, Eddie Vedder with Roger Waters, Kanye West, and the Who slated to perform.

Proceeds from the 12-12-12 show benefit the Robin Hood Relief Fund, which will funnel every cent raised to grassroots organizations in New York and New Jersey helping Sandy victims. Speaking on behalf of my Jersey Shore family and friends, there's still a lot of recovery work to do, and the small groups are making the biggest difference right now. The concert will stream live and air on 34 U.S. networks. You can also make a donation at 121212concert.org or give $10 by texting ROBINHOOD to 50555.

That's my public service announcement for the day. Go Nirvana.