What rock music are you listening to? Non-Jazz, Non-Classical.

[JSngry]

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. 

[BFrank]

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).

[HutchFan]

10 hours ago, Holy Ghost said:

First triple album set?

It's a two-LP set.

In any case, the music is fantastic.