The trio Thumbscrew came about by accident, after bassist Michael Formanek subbed in a band including guitarist Mary Halvorson and drummer Tomas Fujiwara. Something special happened among them right away, so they formed a trio, a co-operative in the truest sense. They play originals by all hands, compositions whose rhythms may surge or lag or veer sideways according to their own internal logic. Bass and drums solo within the ensemble, not in quarantine. No one needs to be loudest. The blend is tight: one string (or metal) sound may bleed into another. It’s something to hear—something twisty and turny and always on the move.