Find a Couple's Registry & Wedding Website
Attire and Accessories
Invites and Paper
Not Engaged Yet
Engaged & Proposals
Generally you pick out the music you want performed. My mom sings and plays piano at a lot of weddings, and 95% of the time the couple have something picked out for her - the other times she suggests some songs she's done in the past and they pick from that. I sang at my best friend's wedding, and same thing - suggested a few wedding appropriate songs, and she picked one from those.