Our violinist was incredible too! I know that technically there is only supposed to be a "first dance" song for the reception, but we also asked for a mother-son dance and father-daughter dance, and it was no problem. I gave sheet music for all the songs, and the one I did for the dance with my dad was an old Irish love song that my dad loved that hardly anyone knows. The violinist played it perfectly!
And after that, he just kept playing, and he was taking requests from my family! I don't know that he could play everything they asked, but I think he did manage to play a few things people asked him to play. Everyone really enjoyed his playing.
We actually debated at first about bringing an iPod and speakers to get the songs we wanted for the reception dances, but I'm so glad we just stuck with the violinist. It was really beautiful.