Foo Fighters are on a break between legs of their "Sonic Highways" world tour.

Over the weekend, Dave Grohl, Taylor Hawkins, Chris Shiflet, and Rami Jaffe kept their chops in shape with a surprise concert at Conejo Valley Days, a county fair in Thousand Oaks, California.

Appearing as Chevy Metal, the moniker of Hawkins' covers band, they raced through an 18-song set composed exclusively of covers. The setlist included songs by AC/DC, Van Halen, Alice Cooper, and Billy Joel, among others. Below, watch video of a Grohl-led performance of Bryan Adams' "Summer of '69," as well as the Knack's "My Sharona" and AC/DC's "Let There Be Rock."

Setlist:
"Stay With Me" (Faces cover)
"Jet Airliner" (Steve Miller Band cover)
"School's Out" (Alice Cooper cover)
"Little T&A" (The Rolling Stones cover)
"Everybody Wants Some!" (Van Halen cover)
"Panama" (Van Halen cover)
"Turning Japanese" (The Vapors cover)
"Summer of '69" (Bryan Adams cover)
"B-tch" (The Rolling Stones cover)
"Under Pressure" (Queen & David Bowie cover)
"Let's Go" (The Cars cover)
"I'm the One" (Van Halen cover)
"Show Your Love" (Van Halen cover)
"You May Be Right" (Billy Joel cover)
"Hurts So Good" (John Mellencamp cover)
"Miss You" (The Rolling Stones cover)
"My Sharona" (The Knack cover)
"Let There Be Rock" (AC/DC cover)

WHAT THE FUCK why dont they announce this shit?