Interestingly, it is an un-conducted string orchestra (named Hilliard String Theory) with +/-26 viloins/violas/cellos/doublebasses. I have been playing with HST for over a year now as a violinist. Not something you'd want to fly in from out of town just to hear, but entirely challenging for me.
Although I got a very pleasant phone call from Steve Sommers, for whom I built a guitar and did an AGF build thread a year or so ago, I did manage to get the peone in before I leave for rehearsal with 40 minutes to spare.