Henry Threadgill, jazz composer

One of the few criticisms that I had for Graham Collier's The Jazz Composer was that he didn't have much to say about contemporary jazz figures other than himself. Henry Threadgill was probably foremost in my mind when I made that remark. The Brooklyn Rail has a fine article by George Grella about Threadgill, with some depth in the discussion about his compositions (hat tip: Avant Music News). Grella mentions Threadgill's Society Situation Dance Band, criminally unrecorded, and suggests YouTube as a source. There's quite a traffic in Threadgill concert bootlegs, so intrepid googlers can find some pure audio documentation out there.