Rocker Tom Petty has been touring extensively this summer with Mudcrutch, his formative band that recently reunited to release their second album. Mudcrutch is a whole new outfit for Petty, with a number of original songs that you won’t find at a Heartbreakers concert. Still, the veteran musician can call upon a friend or two to help get the job done.

Last night on June 26th at The Fonda Theatre in Hollywood, CA, the band rocked through an awesome set before bringing out a big surprise… Stephen Stills. Stills joined in for two Mudcrutch originals, including the set-closing version of “The Wrong Thing To Do” and the encore “Crystal River.”

Check out fan-shot footage of the show from Ed Congdon, streaming below.

You can also watch their take on Bob Dylan’s “Knockin’ On Heaven’s Door” from earlier in the set, below.

The full setlist can be seen courtesy of setlist.fm.