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In the late '60s, some of the biggest names in music converged upon an abandoned linoleum factory just west of London to embark on a magical, two-day journey of music and celebration. From Eric Clapton to Buddy Guy and the Modern Jazz Quartet, the electrified musicians jammed through such undeniably powerful tunes as "Visitor From Venus," "Stormy Monday," and, yes, even "Mary Had a Little Lamb." This is one of the last great rock & roll events of the '60s, and if you weren't lucky enough to be there at the time, this film offers the next best thing.