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A silent gaze, like white light being all colors, divulges all things in polyrhythms and polytonality.

“Absolute Zero,” in contrast, doubles down on piano virtuosity and musical intricacies: odd meters, polytonality, bustling counterpoint.

It might be closer to call what he was doing polytonality rather than atonality.

This American maverick had an unabashedly modernist side, writing works abounding in tone clusters, polytonality and clashing layers of harmony and melody.

Instead, Mr. Mitchell’s playbook leans on long thematic arcs, slithery polytonality, rhythmic caginess and a chamber-like internal logic that carries over to the practice of group improvisation.