Pearl Jam wowed crowds with a three-hour set to kick off their own two-day festival.

The 'Jeremy' rockers opened the PJ20 event - which is being held to mark the group's 20th anniversary - at Wisconsin's Alpine Valley Music Theater on Saturday (03.09.11), and were joined by Soundgarden's Chris Cornell for three Temple of the Dog songs.

The former Audioslave lead singer performed 'Hunger Strike', 'Say Hello 2 Heaven' and 'Reach Down' with the group, while Dan Peters of Mudhoney, Julian Casablancas of The Strokes, and Josh Homme of Queens Of The Stone Age also collaborated with the band onstage.

Pearl Jam performed classic tracks 'Release' and 'Better Man', and lead vocalist Eddie Vedder told the crowd he wanted to thank himself for "hanging onto his passion" when he was younger and pursuing a career in music.

He said: "It's hard to imagine. When you're a kid, you think that music is the most powerful thing in the universe [but] adults around you being practical say that [success in a band] ain't gonna happen.

"Get a nice construction job. We didn't listen. I want to thank the kid I was for hanging onto his passion."