One of the most beautiful love songs ever is "Someone To Fall Back On" by Jason Robert Brown. I would love to have this played at my wedding. The clip has, for some reason, Sweeney Todd and Nightmare Before Christmas film images playing over it, which are REALLY weird choices for this song, but whatever. Just listen, don't watch.
Story: I was at a wedding once where they had all these piano versions of songs playing while people were being seated. There were some hymns (it was a Christian wedding) and a lot of love songs, and then, out of nowhere, "Music of the Night," which is indeed a gorgeous song, but was kind of about a monster seducing an opera singer. Not really wedding material. (Though Christine does find a creepy mannequin of herself wearing a wedding dress toward the end of the song, so the Phantom apparently thinks it's wedding material too.)
Anyway, it inspired me, and now I want slow instrumental versions of Jonathan Coulton songs to play as everyone is being seated. But only the less wedding-like songs. Like "Re: Your Brains" and "Mr. Fancy Pants." Because his melodies are beautiful, and it would be awesome for the few of my friends who also have awesome music taste to suddenly realize, "Wait a minute. This song is about a giant squid!"