Our wedding processional was "The Butterfly Lovers" (http://www.youtube.com/watch?v=Z6Qx9saG45I
) - though as our processional it was arranged for solo flute by our friend, who also played it.
It's concerto based on a Chinese opera that has been compared to Romeo and Juliet. In the opera, a girl is sent to study dressed as a boy, and falls in love with another boy at the school...who also loves her, but he thinks she's male and is very confused, deciding that his views are simply intense friendship. When her marriage to an old, wealthy man is arranged, she reveals her gender to her "friend", they swear undying love and on the way to marry her betrothed, she jumps off a mountain and dies. Her lover follows her (hence the Romeo and Juliet comparison - they prefer death to not being together).
At the end, though, their souls reincarnate as butterflies and they fly off together.
Inappropriate? Well, with the doomed love, suicide and gender-bending, maybe, but it's a gorgeous song, it was played in a concert that we attended on one of our first dates and we were friends before deciding to date - like the couple before she revealed that she was female. We travel a lot so the 'butterfly' thing worked.
So...this is all a roundabout way of saying "don't judge too much - that song may have meaning for the couple".