Notch posted a link to a a song by them.
Notch's tweet

I am SO glad I clicked it.

They're on Spotify, which the link opens in.

It's just a constant stream of rather smooth bass that doesn't rupture your ear drums, with crisp treb peaks behind the bass. Really neat.
It's not quite dubstep, else I'd have put it in the dubstep board.

I have pretty decent (Albeit old, like everything else I own) headphones and it's vibrating my skull, and my ears don't hurt from it.

Have Spotify already? Click the link. Worth it all the way.
Don't have Spotify? Consider getting it. It's pretty neat.

.... Maybe the head-vibration thing isn't good....
There's no dubstep board here.....