Dave Grohl Performs Neil Young's 'Cinnamon Girl' at a Biker Rally: Watch

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Dave Grohl of Foo Fighters performs onstage during the Foo Fighters 20th Anniversary Blowout at RFK Stadium on July 4, 2015 in Washington, DC.

The Foo Fighters' Dave Grohl made time for an impromptu jam session ahead of the band's 20th-anniversary concert in Washington, D.C., last weekend, busting out a rendition of the Neil Young classic "Cinnamon Girl" with a little help from former Pearl Jam drummer Dave Krusen, Jonny Kaplan, Rami Jaffee of the Foo Fighters and Blind Melon guitarist Chris Thorn.

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The audience for the temporary supergroup? The crowd at a local motorcycle rally. Watch the performance below: