It may be evolving into a genre, but I’m not sure that the becoming school of music documentary holds all that much promise. “Becoming Led Zeppelin,” released two months ago (after playing at the Venice Film Festival four years ago and then being rescued by Sony Pictures Classics and streamlined into zippier shape), has certainly been a resounding success. Marketed as an IMAX spectacular, it has made $10 million, and it’s a captivating Zep documentary, with one major qualifier: A story-of-the-band portrait that culminates in the release of “Led Zeppelin II,” the movie can’t help but leave you with a feeling of “Damn! Are we really not going to
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