One random comment before I head off to bed:
I hate the way that German sounds when spoken, but for some reason I like it when sung, as in an opera. It just sounds interesting, and the seemingly absurd number of syllables make for some nice musical potential. I don't really like spoken Spanish that much either, but I do like it when sung, perhaps because it's slower. Spanish sounds really sexy when sung. French I like spoken and sung; it just sounds pretty.
East Asian languages just sound awful spoken and almost as bad when sung. Sorry. I find it funny that the most beautiful written languages are among the most unpleasant-sounding.