Every time the Tesla coil discharges, it will cause the air to vibrate. When the frequency of the discharge changes, the frequency of the vibration also changes, thus producing different tones. Ordinary spark gap Tesla coils cannot do this. Solid-state Tesla coils are generally used. The Tesla coil is controlled by an arc extinguishing circuit board. Through that circuit board, the frequency of discharge can be controlled. Input a music signal, and what comes out is music.