I tried to reply to your hunt for a ceremony musician down below, but The Knot won't let me. Anyhow, I've heard Daniel Fisher play before at a friend's wedding and he was awesome. His phone number is 606-666-2525.
We had a violinist play for ours who is a dear friend and I'd love to recommend her to you, but it sounds like you want a guitarist. If you want the violinist, let me know. I don't check this too often, so you can contact me at emilypluggedin at gmail. GL!