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Rock’s grooviest road warriors headline ‘Long Strange Trip,’ an epic documentary from executive producer Martin Scorsese.

A superfan tunes in for the good vibes.

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Credit: Peter Simon/Amazon

Plenty, it turns out.

But the film still offers lots for Deadheads, and the extensive length allowsLong Strange Tripto get pretty far-out.

He even tracks down reclusive lyricist Robert Hunter for a brief encounter thats one of the films funniest moments.

(The soundtrackis being released this weektoo.)

Its all about finding the gems, andLong Strange Tripis a treasure chest.B+