One of the hottest tickets at the Sundance Film Festival last night wasn’t for a movie but for a rock & roll show. The rock and roll fantasy camp of Dave Grohl’s Sound City concert to be exact. The megaconcert followed Friday’s premiere of the Sound City documentary, the directorial debut by the Foo Fighters frontman. Spanning nearly five hours, the packed gig Friday night at Park City Live featured the reunion of all of the remaining members of Nirvana as well as members of Queens of the Stone Age, Rage Against The Machine, Cheap Trick guitarist Rick Nielsen, Slipknot singer Corey Taylor, Fear frontman Lee Ving and Rick Springfield. Yes, that Rick Springfield and let me tell you “Jessie’s Girl” never sound so good. Then again, the cover of Cheap Trick’s “Surrender” earlier, with Taylor on vocals, Nielsen on guitar, an ear-to-ear grinning Grohl on drums and Nirvana’s Krist Novoselic and Pat Smear, had really gotten the crowd going with a stadium sized sing-a-long. The Sound City doc, which Gravitas Ventures picked up the VOD for before Sundance, details the history and legacy of the famed San Fernando Valley recording studio. The nearly 40 songs performed during the show were ones that were recorded at the now defunct studio, with Grohl’s Foo Fighters playing house band. I had to split the show after two hours to hustle down the Library Center for a 11:45 PM screening of the cannibalistic We Are What We Are. However, I heard that mini-sets from Fleetwood Mac’s Stevie Nicks and CCR’s John Fogerty later only served to crank things up to rock heaven. Outside, Sundance was rocking in other ways. Up and down Main Street, clubs and other venues were packed with crowds of would-be partygoers spilling out on to sidewalks, trying to get in to this film or that film’s event. When I was heading back around 2:30 AM, not a lot had changed. But would you expect anything less from the first Friday night of Sundance?