Hard rockers the Foo Fighters have enjoyed huge success since former Nirvana drummer Dave Grohl founded the group in 1996. Now, with this unsparing documentary about the band, fans can get some historical perspective on the influential grunge musicians. The film explores Grohl's pre-Nirvana punk roots and features previously unseen concert footage as well as in-depth interviews, a trivia quiz and recording sessions for "In Your Honor."