[@Demonic Angel]
So I think it'll be great if Elsa and Vae perform "The Last Rose of Summer" together since it works really well as a duet. 
The song is essentially about a rose who is the last surviving rose before fall and is lamenting being alone because all of her fellow roses are dead. A being, the spirit of fall presumably, comes along and convinces her it is better to go to sleep (die) than to be alone.

Do you have a preference for Vae's part?