Bouncing ball music videos from any melody

Pick a built-in melody (Ode to Joy, Twinkle Twinkle, Für Elise or Korobeiniki, the Tetris theme) or upload your own MIDI file. Every step hit plays the next note in order, and the video ends when the melody does: the whole staircase lights up and the song title appears.

How it works

1. Each seed generates a zigzag staircase (6–14 steps) that the balls hop down.
2. Every time a ball lands on a step, it triggers the next note of the melody. The note counter on screen keeps track, and after the last note the video wraps up with a short finale. The built-in melodies run about 20 to 35 seconds.
3. The audio is synthesized and rendered directly into the MP4, so notes and bounces are always perfectly in sync.
4. Upload a .mid file in the export panel to play your own song instead of the presets.