After attending a performance by John Moran at PS122, James and I encountered this violist improvising on the platform across from us in the L train's First Avenue station, with a bit of unexpected dance accompaniment. This is a station where you can't cross over to the other side without going back to the street, or we would have moved over there to give him some money and talk to him. If anyone knows him, ask him to drop me an email.
The video is made up of several clips that I combined, and I'm no video editor. My apologies for the abrupt transitions.