With the release of their new LP, 'Sonic Highways,' behind them, the unstoppable arena rock force that is the Foo Fighters has moved into full victory lap mode. As evidenced throughout his career, Dave Grohl has had no trouble making a lot of interesting friends.

The latest high profile Foo-llaboration came on Nov. 14 at the Roxy in West Hollywood when the band was joined by Eagles guitarist Joe Walsh. The pairing rocked a run through of the classic 'Rocky Mountain Way' and new joint track 'Outside.'

As if that weren't enough, Lollapalooza founder and Jane's Addiction frontman Perry Farrell came out for a once in a lifetime performance of 'Mountain Song.' Check it out in the video above.

You Think You Know the Foo Fighters?

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