Actually, some of the instrumental parts in the middle of "Fallen Angel" appeared later practically unchanged on Gabriel's "Come Talk to Me". A great song, and a great album, I agree. The track "Go Back to Your Woods" from his still quite good second album Storyville has similar themes and quest performers, though it's not prog.
I think one obvious example would be Gila's classic Bury My Heart at Wounded Knee. All the texts deal with Native Americans and the music carries the flavour too - even if Conny Veit rejected the original tribal melodies as too simplistic and composed his own tunes around the texts he borrowed.
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