Paul McCartney rocked on Saturday Day Night Live and the following day he joined Nirvana to release the studio version of "Cut Me Some Slack." McCartney and Dave Grohl used the 12-12-12 concert to debut the song. It's from Grohl's upcoming documentary Sound City about the grungy recording studio where albums by Fleetwood Mac and Nirvana were recorded.

 

The documentary premiered at Sundance.

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