Embed a small piano in the browser and request the user to play DIS:
Thats not the Death Waltz though. It’s from a japanese videogame if I recall correctly. (I don’t know the name tbh but if you really want to know I can find out. I know a friend of me knows it 
)
that sheet music is from Aphex Twin i believe.
Duuno the sheet, but here’s the game:
One man project.
now what I want to know is how I can block those, that only I seem to think an annoying spammer. might just try and write a browser userscript for that…