Yay! Music! Robert Holmes!
It's interesting that he's a guitarist rather than a pianist. The reason why I've always liked the GK1 soundtrack best is precisely because I think the following games' (including Gray Matter) rely too much on piano themes, whereas GK1 had more variety. Here's hoping that Moebius will feature more guitar tracks. Malachi definitely looks like a guy who could have a guitar theme — contrary, I guess, to Sam and David (or Grace).
It's also interesting that, of the four themes he chose to post, one was not actually used in a game ("GKSuperloud" was an early option for the GK3 main theme; to be honest, I much prefer the
piece that was eventually used in the game).