When Mark toured with the Undertow Orchestra they seem to have got quite a bit of publicity.
Glide Magazine have an interview with all the band members.
There is another interview with them and a couple of songs on Minnesota Public Radio.
There is also what looks like a video of a show in Athens, Ga.
There are a coule of YouTube posts but nothing with Mark on it really.
Finally there are a couple of recordings around. There was a nice piece and a complete show up on (the realllly good) Bradley's Almanac. Unfortunately he has taken the tunes down now but I am sure they are still around somewhere. Further searching shows It's Hard To Find A Friend also has another whole show. I went to the Union Chapel gig which was one of the best shows of last year. Anyone out there have a copy?