This one is in my head since last night. But not the entire version, just the alto part with some bits of everyone else’s part here and there. That’s what happens when you sing a song instead of just listening to it!
In fact, I now find the complete version extremely difficult to listen to as all sections combined disturb my knowledge of the song just for the part I learned.
In any case, it is a beautiful song, whether you’re singing or listening to it.
The complete version:
And the alto version: