Paul McCartney, Nirvana Alums Rock 'Cut Me Some Slack' at Sandy Concert
Paul McCartney, Nirvana Alums Rock 'Cut Me Some Slack' at Sandy Concert

Judging from the veracity of Dave Grohl's whipping hair, Wednesday night's Nirvana jam session with Paul McCartney a the 12.12.12 Concert for Sandy Relief went over swimmingly. The promised marriage of the most important band ever (The Beatles) and the most influential of the '90s (Nirvana) resulted in a thrilling few minutes of spontaneous, raw magic.

After a quick story about "jamming" with a few guys recently, McCartney said it dawned on him that he was "in the middle of a Nirvana reunion." After introducing Grohl, Krist Novoselic and Pat Smear to the stage, the quartet tore into a thick and bluesy track called "Cut Me Some Slack," about having fun or rolling into town (or something).

Grohl appeared at home behind the drum kit and Novoselic, wearing a loudly shiny shirt on his tall and bearded frame, bopped around in his trademark slunched-over stance.

"Cut Me Some Slack" will be included on the soundtrack of Grohl's new movie, "Sound City Movie." Hear a snippet: