Omg! YES! A thousand times YESSSS to Let There Be Peace On Earth! With Mairead C singing high in the soprano range! *shivvers*
One addition though? I know some don't like the movie but I would love love LOVE to hear Susan belt out Let It Go from Frozen! The Idina version. Not Demi Lovato's.
Also! What about Patapan? Every time I've heard it it's been close harmony so maybe for an a cappella song?
OMG I would LOVE to hear Susan sing that!!! And I've heard that other song once but not in ages but I'm sure CW would nail it! I mean they can sing the phone book lol!