The Foo Fighters are spending this week with David Letterman doing a residency leading up to the release of their 'Sonic Highways' documentary, which premieres Friday (October 17) on HBO.

Following Monday's cover of Black Sabbath's "War Pigs" with country music's Zac Brown, the Foos on Tuesday welcomed Rock & Roll Hall of Famers Ann & Nancy Wilson to perform the Heart classic "Kick It Out".

Whether you're a Foo Fighters fan or not, you've got to love Dave Grohl for his passion and his respect for the bands and artists that paved the way for his career and those that come after. Check out the video below from the Letterman show Tuesday night and then do yourself a favor and rent the documentary "Sound City" which Grohl did about the legendary recording studio that saw Fleetwood Mac, Nirvana, Rick Springfield and SO many more come through.


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