Novalis,
A very good question. I also have wondered about the same thing. Since the early 1980s it's hard to find any of Gordon's songs published in songsheet format, not to mention choral arrangements.
I know there has to be something out there. Case in point: The East York Choir sings a beautiful rendition of "Song for a Winter's Night." Hearing this choir sing one of Gord's most beautiful songs still sends chills down my spine.
They definitely did it from a special choral arrangement:
I wonder if this is something that would ever be available through an arrangement with Gord?