It’s the Super Mario World Castle theme, but performed on musical tesla coils!
Note: The loud music actually comes from the sparks from the tesla coil. It’s literally playing the music due to the programmed phase, pulse width and trigger frequency! So there are no speakers, no audio / video special effects. Just the drum backing track that is not played by the tesla coils. It looks even better in person and sounds almost the same, just louder than people expect.