For the amount of recorded material available for fans, no artist comes anywhere close to rivaling the Grateful Dead.

Throughout its 30-year existence, the band always encouraged audience members to tape shows for posterity. That tradition continued after the demise of the original band, as subsequent projects after Jerry Garcia's death - The Dead, The Other Ones, Phil Lesh & Friends, Ratdog and others - follow the same policy. And plenty of those shows are available online, with the musicians' blessing.

Commercially, the Grateful Dead has issued a continuing series of archival recordings, called "Dick's Picks" after the band's longtime archivist, the late Dick Latvala. The series is up to its 25th volume now, and the latest installment has a pretty good story attached.

In 1971, it seems, Garcia gave a bunch of the band's soundboard tapes to future Dead keyboard player Keith Godchaux, to help him learn the repertoire. The tapes were promptly forgotten and stowed away, finally seeing the light of day just this year.

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Question (get it right, and I'll send you a copy of the recording): On what Grateful Dead album did the late Keith Godchaux make his debut?