This is not an album, but if you have the time check out
Majandra et RoBERT - le prince bleu d'arthelius. The song is featured on
this site. I love the dual parts, and although when you try and listen to the individual voices it sounds like it's all wrong, as a whole this is a great song.
Don't bother checking out anything else of Majandra Delfino because she's shit.