Passacaglia
Filmed as seriously as I could manage — until my daughter found the lens.
The last section of the Handel–Halvorsen Passacaglia, played on the upright at home in one unbroken take: the sound is never edited, and the four camera angles are all cut from a single phone frame. It opens with the take that did not go to plan — my daughter got to the lens first — and then starts again, played straight to the final chord.