Andy Brewer is an audio engineer and composer. He was playing around with pink noise, what we lay people would call static or just noise, on an equalizer and found he could extract musical notes from it with a little work. Could he play a song using just those notes? It would be a song without a voice or musical instrument. Yes, he could, although it was a lot of work. You wouldn't be able to do this if you didn't know a lot about music already. This song is technically "electronic music," and it's what a synthesizer (which is a musical instrument) does, although Brewer didn't use a synthesizer; just an equalizer.
Music buffs in the comments said this is an additive synthesizer or a subtractive synthesizer. I don't know which is correct, but it took many people many years to develop the music synthesizer, while Brewer started from almost nothing and figured it out on his own. I'm impressed. The song is quite pleasant, too. -via kottke