As the article says, Schwindt is very easy going, RIDICULOUSLY GOOD, and fun to play with. The other members of the house trio, however, are less "low-pressure", and easy-going. They seem to be amongst the jazz elitists, who will frown upon your every clam and not be so happy if you call a tune that isn't "hip" to them. I guess it keeps the quality of musicianship at this jam rather high, but it can be intimidating and hard to break into their circle of "we are the shit" mentality.
