Double Albums of the '60s & '70s

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On this double decade day of '60s & '70s music, what are your favorite double albums from the '60s & '70s? We'll spin a set after 9 a.m.

UPDATE Today's set:

Fleetwood Mac "Sara" Tusk

The Jimi Hendrix Experience "Rainy Day, Dream Away" Electric Ladyland

The Who "I'm Free" Tommy

The Grateful Dead "Bertha" The Grateful Dead (Skull & Roses)