It's a comic based on that style of game. Kind of hard to get into, but even more difficult to get out of. All these little grey skinned kids we have as avatars are from HS. Terezi, the girl Chojin and I both have, is by far the most adorable and you should think so too.
But yeah, the music is awesome. They put out a new Homestuck album every month or two.
You really should check it out.