Someone at the show tonite asked me if I could find out the name of this song. I have not had a chance to ask Tim yet but after scrutinizing the setlist, I am guessing it is called Congas in "C". I do not think this in on an album, it seems to be more of a improv piece that has just started showing up in the sets in one form or another. If I get any more info on this one I will post it here.
I asked Tim about it and he said it is actually Drop C and it is Congas in C which a new improv piece and has not been recorded except at shows. So you may be able to find a copy from one of the tapers from this tour. Tim never made it out that night. His family had just driven in from Santa Fe and they were very tired and wanted to get back to the hotel with them. Maybe next time. Tim not signing is very rare. Glad you enjoyed the show and glad I could help with your song request.