If I'm not mistaken, this is when party people were taking "disco hits" of acid. Not microdosing, just not the full 1960s ego-death dose.
With this music collection it would have been quite a vibe. Damn. Can you imagine tripping to Jackson 5 "ABC" and then King Crimson plays?
In the early days of disco they were throwing ass to In the Court of the Crimson King