Mairi was at Celtic Colors in Cape Breton, Canada, a couple of weeks back. Here's a short clip of her playing with a mix of Scottish, Irish, Canadian and American musicians in a project called The Fiddle Tree. Otis Tomas the guy on the left of the stage made the two fiddles, the viola Mairi's playing and the cello from wood from the same tree, and wrote the music that the band is playing.
http://www.youtube.com/watch?v=YREwgIYZnXo