Happy New Year, fellow Knotties

My FI and I were looking over the choices for ceremony music this week and I could use your expertise. We're getting married at VOF at MB. I'm a musician, so this portion of our ceremony is very important to me.
Do the violinist/pianist play everything on the list, or do they play a CD for the pop songs? For example, there's a Jason Mraz song we want as part of the seating music and prefer his recording. Similarly, if you bring a CD, can you just bring a disc for seating music only, and have them play the ceremony music?
I don't mind the musicians playing the classical pieces, but if they're going to play pop songs, too, we may just use a CD of our preferred pieces.
Thanks, all!