by Nate Chinen SEM and Ostravska Banda perform Muhal Richard Abrams, George Lewis, & Roscoe Mitchell // The Trio (Abrams/Lewis/Mitchell) “Reductio ad absurdum!” Thomas Buckner pronounced, in stentorian voice, at one point in “AACM50,” a momentous new-music concert on Wednesday night at the Bohemian National Hall. It was just one of many lines of text, […]