21. Pigs On The Wing (both parts)
The happy song on Animals. The other three are full of Orwellian references and Waters heavy-handedness, but this is an escape. I listened to this during biology today. Teacher didn't notice.
20. Astronomy Domine
There are actually two versions of this. One was on The Piper at the Gates of Dawn, an album mostly known for being "the one with Syd Barrett." The other is on Ummagumma, and the length is nearly doubled. Myself, I prefer the original. The voice reading out the names of stars at the beginning is the band's manager at the time.
19. See Emily Play
This sounds like a Beatles song on even more acid than usual (for a Beatles song.)
18. Point Me at the Sky
This didn't do so well in 1967 when it was released, and it is one of the most difficult songs to find. It is also the one that I just got a week ago. (Thank deity of your own choosing for BitTorrent. …