This song is the first to ever exist completely on-chain. This is achieved using ABC notation. If the video or audio for the song were to disappear, you would be able to recreate the song using the ABC notation stored directly in the contract. ABC notation is both human and machine readble. This means that if you learned to read it you could, but you can also take the notation and put it into any number of converts to output traditional notation, Music XML or even MIDI.