Wow! You guys don't think DC3 have tight harmonies?? I think they're amazing. Mariah's are great, but sometimes they're a little hissy-sounding because of the airy vocals. Also, I don't like the background singers that Mariah uses now. Her harmonies have suffered. Aside from that, I think they're fine. I can't think of any examples of great DC3 harmonies right now. Maybe somebody can help me out?

Speaking of harmonies that are all over the place, Madonna's are pretty iffy. Most of the time she just layers her vocals without thought to harmonizing them. It sounds alright, but they could really be improved.
"Prayer does not change God, but it changes him who prays."
--Soren Kierkegaard