To me, one of the most beautiful things in all existence is the sound of male and female harmony. There's just something about it that's unlike anything else...
[video=youtube;c_iP1QBsC98]https://www.youtube.com/watch?v=c_iP1QBsC98[/video]
I agree with you.
You Are Holy (Prince of Peace), one of my favorite songs, is not the best song to illustrate your point because there is not much of male/female harmonization in it. However, there is, in its essence, different kind of harmony when both men and women are singing together about Jesus, sometimes following one another, sometimes singing two completely different lyrics simultaneously yet singing about one same subject - that is Jesus. It's just beautiful, BEAUTIFUL. Lastly, around 3:17, it almost feels like it's coming from heaven as you listen while your eyes closed - this is one song I want to practice and sing with my wife together because the song implicitly illustrates what two different people, different gender with different background, can make out of their differences when they sing in one heart with their eyes on Jesus only. Amen haha!