The Bad Plus' blog has a very interesting post about early recordings of The Art Ensemble of Chicago - DO THE MATH: Nessa Records: "The most outstanding thing about this early Art Ensemble music is the ferocious determination of great players to advance the music even further. The Art Ensemble didn’t imitate any of the styles on the above roster. Famously, it was Chicago music. New York City—where all those other records were recorded—was far away, with its own hectic pace. When compared to any New York band playing free, The Art Ensemble was spacious, delicate, and thoughtful."