Mitchell, a free-improv master, runs the gamut here on his sax (and occasionally on flute). "Knock and Roll" boasts steadily rising intensity for eight wild minutes. But this isn't a one-tone album, as Mitchell proves with the half-hour of zen-quiet rumbling over the next two tracks. Piano star Craig Taborn takes care of acoustic chops (on the opener) and blasts of avant-organ (on "Who Dat" and "Splatter"). Newcomer percussionist Kikanju Baku shows range, too--breaking off pieces of drum shrapnel on the power workouts, and employing more reserved approaches during ambient pieces.