That Pink Floyd album was going to be the first one that I listed.
Pink Floyd really needs to be viewed in 4 segments (imho):
1) Syd Barrett-led experimental albums.
2) Collaborative efforts.
3) Roger Water-led albums, when his ego was at peak.
4) Post-Roger albums.
That Umagamma album must have been to just fill a contract. B/c it's un-listenable.