It's not visual art but this is too awesome not to share. I'm not the most knowledgeable opera fan, but since I was 15 I've adored and am continually blown away by the duet from Bizet's "The Pearl Fishers". The clip below has english translations, but I think the best way to listen to this is with your eyes shut and listen to the singers voices soar and weave around each other (hang on to 1:43 when it gets REALLY good). Totally sublime. I never get sick of it. Hope you enjoy it!