I sang Fields of Gold (Eva Cassidy's version) at my niece's wedding and it went down a treat.

Eva herself said that she sang You Take My Breath Away at weddings.

I confess I have also sung Never Wed an Old Man!

It was however upstaged at one wedding by the bridegroom's madrigal group singing A Long Prick (musical notation term and double entendre of the era.)

Bliss to the happy,
Chris