I have done so in the past. Usually, the show coordinator will want to work with you to pick the music. Try to mix it up. Music for the guys and bridesmaids is usually more fun, while music for the Bride and MOB dresses is more traditional.
I try to use a little bit of everything, including some really new stuff.
One of the problems I've had is with wedding coordinators who want to use lots of off-beat, personal faves. The last thing I want is potential customers thinking I picked all Enya and Yanni for the show.
Usually though, they're open to your ideas.
Mostly mix upbeat music as the girls are strutting their stuff. When Dad's and Mom's are out...something more subdude but don't put anyone to sleep. Keep it fun and lively. Remember...You are not only showcasing the fashion show, but, you are also showcasing YOU.
Don't let the fashion people dictate YOUR job. Sometimes what they suggest will make YOU look just plain BAD!
The audience won't know you are not in control of the music.
I only play 20 to 40 seconds (or so)of a song then mix into something else. When there is a good bridge. You don't want to be stuck on 4 minutes of any one song. Audience wants a variety as much as they want to see different dresses. Keep it flowing.
Don't take this wrong but as a PC jock, it afforded me the oppertunity to change songs in a seconds notice. The fashion show people changed up the order and I had to quickly cue up different songs in different orders as fast as I could type.
If you are a CD jock...get them to nail down a script then have them follow it. Nothing like "White Wedding coming up when Grandma is stepping on the stage. (although it might be good for a laugh)