The titles tell part of the story: With its unison lines, the exciting "Filters" starts like a standard bebop "head" tune, but the way Rosenwinkel and Turner split the theme intimates what Rosenwinkel means by the title. The two circle each other, mimic each other, duel each other, and above all spur each other on, creating some of the more invigorating moments on a disc that most often works on a more intellectual plane. And the title track, on which Rosenwinkel plays lovely, rubato piano, feels like the voyage it's meant to evoke. The Next Step swings pretty hard, too, on tunes such as "Zhivago," "Minor Blues," and "A Shifting Design." It also can be languid and lovely, as on the shadowy "Path of the Heart" and the sensual, echoing ballad, "A Life Unfolds." But it swings and sways complexly, suggesting that the dimensions of Rosenwinkel's versatility are yet to unfold. Such rich work also begs for performance.