Music documentaries, as a genre, do not perform well at the box office. Nor do they do particularly well on DVD, making the sizable slate of theatrical releases related to music in 2013 one of the year's bountiful anomalies. "Searching for Sugar Man," the 2012 film about a forgotten singer/songwriter, won the Academy Award for best documentary earlier this year, and it's possible an audience thirst has developed for more stories about the unknown corners of pop music, especially that created in the '60s and '70s.

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