"It was a place that changed my life," Grohl continued while introducing the film. "I walked into Sound City and I was like a kid, I was twenty-two. I had no idea that the next couple weeks would change my life forever," he added, referring to the time it took for Nirvana to record their seminal 1991 release, Nevermind, in Sound City's notoriously dumpy halls.

After the movie, the crowd of family, friends and musical icons (producer Butch Vig was spotted in line for popcorn) trekked two blocks east on Sunset Blvd to join thousands more at the sold-out Hollywood Palladium for a special all-star concert that Grohl warned would be "f***in' long."