Cap'n,
The question in the end is what do you show on the screen while the music is being played - what do you want the viewer to see?
As much as I love Kevin Burke's fiddle playing, the last thing I want to watch while he magics his way through Bonny Kate and Jenny's chickens is the top of his head.
For me it boils down to whether there is a place for simple performed music on film - it's a question that has never been convincingly answered for me.
Jim