OK - here's that post I promised.
When I saw the thread title - I immediately thought of Spirit's
"Twelve Dreams of Dr. Sardonicus" from 1970.
Why, you ask?
Because it was a theme album. Side One being traditional "Rock"....and Side Two was considered "Space" themed music.
Remember....back then there was a LOT of creative thinking.
Without further ado......I give you Side Two of Twelve Dreams of Dr. Sardonicus.......