Paul McCartney, "Cut Me Some Slack" (2012)
When Grohl made the soundtrack to his film, Sound City, he teamed with dozens of guest musicians, from Nine Inch Nails' Trent Reznor to Stevie Nicks. The most famous artist he worked with was Paul McCartney, who wrote and recorded the heavy jam "Cut Me Some Slack" with the surviving members of Nirvana. As a surprise, the Beatle welcomed Grohl & Co. onstage with him at the 12-12-12 Concert for Sandy Relief to give the song its live debut. They later performed it on Saturday Night Live and at a 2013 Seattle gig. Grohl previously backed McCartney as a drummer on "I Saw Her Standing There" in 2009 when the Beatle was honored as MusiCares Person of the Year. Grohl and McCartney have done "I Saw Her Standing There" a few times since, including once at McCartney's 2015 London gig where Grohl played guitar and sang the chorus in the same mic as his idol.