An instrument where gravity is the music theory.
Drag outward from the star to place a planet. Distance sets the pitch — each planet chimes as it crosses the bright ray. Planet size is loudness, and loudness is mass: play too loud and the song tears itself apart.
Intervals that share small whole numbers with an orbit — the fifth, the octave — lock into resonance and groove forever. Dissonant ones drift out of tune and die. Raise the speed to hear a melody's fate.
Tap a planet to remove it. Nothing is quantized: gravity judges.