It’s possible though it really isn’t necessary and isn’t something that is normally done.  Typically your performer(s) will just need to be cued when your wedding party is ready to enter. When the wedding party has finished, the officiator will ask everyone to rise and the musician(s) will begin the processional song for the bride.

If a customer really would feel more comfortable for the musician(s) to be there for the rehearsal, the fee is $150 for the musician or group leader to come and play. (and subject to availability)