Great rock-docs need blood on the floor

As three forthcoming films attest, music biographies are at their most compelling when warring egos are intrinsic to the taleWho actually watches rock documentaries? It's a persistent question, invited yet again by three prestigious new studies of George Harrison (Martin Scorsese's Living in the Material World), U2 (Davis Guggenheim's From the Sky Down) and Pearl Jam (Cameron Crowe's Pearl Jam Twenty). While not as Pravda-like as the record company-funded featurettes you find on DVD extras or l...

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