Dave Grohl Reunites with Foo Fighters Bandmates ... for EPIC 'Under Pressure' Cover

Dave Grohl got back on stage with some of his Foo Fighters bandmates this weekend and played the David Bowie + Queen hit "Under Pressure" ... AND IT WAS AWESOME!!!

Grohl was performing at the Costa Mesa Fairgrounds with Chevy Metal -- a band featuring Foo drummer Taylor Hawkins and Foo guitarist Chris Shiflett.

The band also performed a bunch of other covers ... including Van Halen’s “Panama" and "My Sharona" by The Knack ... but their performance of "Under Pressure" was the highlight.