I actually made a CD comp of their 1969-era and it's all I need from that period. Here's how it goes:

Azrael Revisited (1)
Diary Of An Empty Day (1)
For Example (1)
I'm One Of Those People (1)
Pathetique, 3rd Movement (2)
Hang On To A Dream (1)
Five Bridges (3)
Blues Of The Prairies (1)
Country Pie/Brandenburg Concerto #2 (1)
Rondo '69 (1)

1 - From the Diamond Hard Blue Apples Of The Moon radio sessions comp
2 - From Elegy
3 - From Five Bridges

I think it holds up as well as Thoughts and Ars Longa.