At the risk of alienating myself from all other classical violinists, I'd like to encourage all brides/grooms-to-be to feel free to ask your violinist to play Cyndi Lauper on solo violin for your wedding, or to make other such requests. Really.
Last summer I played solo violin at a wedding on one of the Diamond islands. The bride wanted "Air on the G String". After my initial "she wants what on solo violin?" I took on the challenge and created what I thought was a very successful arrangement, incorporating both melody and bass, double stops, etc. It was fun! Having classical music at a wedding is nice, but if you're having a wedding outdoors, nothing beats having a single violinist standing up with no music, just the violin, playing beautifully for people and for nature. It's such a nice image! But I suppose I am biased. :-)
This past Saturday I played a wedding over at Kettle Cove. This was a last-minute affair and the groom called me only three (maybe two?) weeks in advance. I was sort of lukewarm about taking the gig (why I don't make my sole living from violin: so I can refuse gigs when I want to), but when he said that he wanted the bride's processional to be Cyndi Lauper's "Time After Time" as a surprise for his bride, I had to do it. I mean, it was sooo cute. $0.99 later I had downloaded it from iTunes, listened to it a bunch of times (those were the days! What was that, like fifth grade?) and concocted a version for solo violin. Double stops like crazy. After that workout, "Ode to Joy" was a piece of cake.
I decided that those are my favorite weddings: the ones where I play solo, get to make up my own arrangements, and play outside in gorgeous locations. So don't listen to those musicians who want to charge you extra for it. ;-P