I didn't get to listen to the whole thing but I did listen to a few more tracks today and yes, I'm surprised by how different they are! (That Philipe le Bel / Juana one, wow, that's really cool. I am not totally sure but I think they might have arranged the instrumental bit as well (I found an a capella version of the music, anyway, which seems more likely), and I really like that arrangement.) I've really enjoyed what I've heard. And it's really cool that you have the historical background to appreciate it too :D

Eeee, thank you for the An die Musik! Seems pretty on-point for a movie about an aging opera singer.