i may choose lost in this moment by Big and Rich! its a very beautiful song but also classy. if you are thinking classic rock try eric claptons wonderful tonight or even something by the beatles
nee nee88
A really nice "catch-all" song would be the "tennesse waltz" for those who like country and those who don't. You could always use billy joel's "just the way you are" or the carpenters "close to you" and lionel richie's "three times a lady", of course.
A good song to be playing for a first bride and groom dance is "From this Moment" by Shaina Twain. Another good song is "No One" by Alicia Keys. Anyhting by MAriah Carey will also do.