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Each video is rendered in Blender from the same features array that produced the audio, so the instruments on screen are playing the notes you hear — not an approximation of them.

BWV 261 — Allein zu dir, Herr Jesu Christ

Nine instrument sections — strings, marimba, finger piano, bass, woodwind, brass, bowed strings, melody, and a conductor — rendered separately in Blender and composited into one stage. The notes on screen are the notes in the audio: the animation is driven by the same features array that produced the tuning.

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More are being rendered. New ones show up first on YouTube.