Each spark unleashes a bolt of plasma that makes the air explode. Repeat these explosions fast enough and you get a musical note. Four coils, four notes. Custom electronic hardware and software convert MIDI encoded music to pulses of light. At the other end of four fiber optic cables, the powerful amplifiers in the bases of each coil transform 300 volt DC power into hundreds of thousands of volts of musical lightning.
Even in slo-mo, lightning is fast!