[mcmire]

MIDI was never intended to be playable by people. It's just a protocol, you can do whatever you want with it. So saying that this is "impossible" doesn't make any sense.

That said, this music sounds atrocious when you run it through a computer, it'd sound better if it were spread out across multiple instruments, but whatever.

[walshemj]

Yes if you displayed the full orchestral score to Beethovens 5th on to a single grand stave it would look "black"

[Cthulhu_]

Whilst clicking through the related youtube links, I found a 3D representation / rendering of one of these tracks (instead of the 2D one shown on most videos), with the notes cascading downwards onto ten rows of keys - gives a bit more perspective to how they made it.