I listened to Dark Side one memorable night on a Detroit radio station as soon as it was released. Probably WABX, WRIF. Was so intrigued, and it took me many listens to figure out why I couldn’t replicate the song in my head, I kept trying to add notes to fit it into 4/4.
Yeah, that whole album is very complicated, musically.
The 70s were kind of the highwater mark for musical complexity in rock and pop music.