Does anyone recognize this solo of Neal's???

I've had the full concert of this show since about 1999 and always like the opening solo, but didn't recognize it from anything. Does anyone know if it is part of any of Neal's work, or is it just Neal playing around?
http://www.youtube.com/watch?v=PpnGt1dNtoY
http://www.youtube.com/watch?v=PpnGt1dNtoY