I remember getting the self titled album by Tomorrow and remembered how horrible it sounded in stereo. I used a free sound program to make a fold down mono and it sounded better. Any albums do you think sound better in mono? Here's what I found:

Rubber Soul - The Beatles
The Doors - The Doors
The Grateful Dead (1967) - The Grateful Dead
The Piper At The Gates Of Dawn - Pink Floyd
A Gift From A Flower To A Garden - Donovan
Paranoid - Black Sabbath