Foo Fighters held their second annual Cal Jam music festival last night at San Bernardino’s Glen Helen Region Park. In addition to the billed lineup — which includes Iggy Pop with his Post Pop Depression band, Tenacious D, Garbage, and METZ — the members of Nirvana reunited for a surprise set with Joan Jett and Deer Tick’s John McCauley filling in for the late Kurt Cobain. See some video here