Here is BFT 261.  Something for everyone (including @Dan Gould for one cut), and my usual boundary stretching and 60's/70's-centric focus.  Looking forward to reading and responding to your impressions and guesses.  Only one cut that is likely to stump everyone (even @rostasi ).  The person with by far the best chance of getting it is @randyhersom (and that's a clue). https://thomkeith.net/blindfold-tests/2025-blindfold-tests/   

All 4 Let's Active albums, which have been OOP for a long time, have been remastered and are currently being re-released by the band, only on streaming platforms (at least for now).

Per Google AI: The first major rock triple LP set was the Woodstock: Music from the Original Soundtrack and More album, released in August 1970. George Harrison's solo album All Things Must Pass followed in November 1970 and is considered the first rock triple album of new studio material. 

Recorded in 1963.

Yes! 2112 tour! First triple album set?