I'll be walking down to River Flows in You by Yiruma (which I've dreamed of walking down to since before Twilight made it popular!). We've hired a violin/cello duet to play during the ceremony who will put together a nice composition of it.
Every time my mom heard the Christmas Canon by Trans-Siberian Orchestra that's what she envisioned me walking down the aisle to so I surprised her by having that as my professional song. I only included the music not where the choir sings.
I have told my FH I am walking down to a different song, but I'm going to surprise him and walk down to the instrumental version of our song, Aerosmith's "Don't Want to Miss a Thing. " I sing this song to him at night before we go to need most nights. It started out as a joke, but now is our wedding song since it has so much meaning!!
We're going very non-traditional for all of the specific music selections. For the processional, we are walking to "Thank You" by Led Zeppelin. They are my all-time favorite band, and it is a really beautiful song. The first (and last) lines say "If the sun refused to shine......I would still be loving you. If mountains crumbled to the sea..........there would still be you and me."
Oooooohhh I got goose bumps just typing that, and hearing it in my head!! LOL I'm such a weirdo.
I always tell people to pick a song that speaks to you (and FH), and go with it.