Girls respond to moods, hooks, voices, and melodies.
I have as a constant always heard where's the vocal from my girl and her friends. Tribal works with the latin based crowd, but thats obvious. I do agree with the wanting girls to be involved idea. Nothing sexist about it, but in comparison things are kind of not the same as far as the trained ear. Not too many fellas dig nsync or backstreet, this is in comparison.