hee hee Steve.
Rudi, I actually wrote out what the chorus progressions were, but then decided not to post 'em. All 3 configurations looked DAFT to me, a dom and sub dominant in sight w/ one possibility...but a iii in there as well?
Unless I'm totally off in figuring.
The song fades out (of course) so no ending chord...if playing live, we'd fade! (j/k 1/2 way). I think either D or E...or C for the left-ambiguous ending.
Anyway: E - D - C - D - E
key of E: I - vii - vi - vii - I
key of A: V - IV - iii - IV - V
key of D: II - I - vii - I - II
I guessed "D"...it looked the least weird of progressions, at least there's tonic, and something about the 7th made me think, "yeah 7 resolving... to tonic". That's the thing, it doesn't sound weird, resolves naturally and all, kinda hook-ish - only looks weird.
Your suggestion on finding the closest thing to a chorus of I IV V, or II V I etc; was the method I decided upon, before I posted (as well as taking into account beginning chord).
(Side note: That...little project I've been doing for months...it was through scoring that I seriously began to wonder if the key is C, tho C is certainly not the focal chord. I had to go back and naturalize all the #'s and stuff in key sig and throughout, because I realized thru playing that there were NO accidentals, and that sucker should have been riddled w/ F#'s...what are the modes...perhaps it's an alien - I mean aolean - mode. Right? Isn't that no accidentals...and something about the I [C] to the VI [A]...IIRC)