Might I mention our own band or would that be self indulgent?
We are called Moth. (Not to be confused with the USA band of the same name)
tinyurl.com/mothbanduk
I've posted this before, but for those that haven't seen our little video yet:
I quite enjoyed that! The video was excellent too. Tip of the hat to you, good Sir.
I'm going to be bold and suggest Meat Beat Manifesto. Their music has an industrial/grungy theme to it (which is probably more suited to dieselpunk, but hey ho) and it reminds me of the more mechanical side to steampunk. If I were going to suggest a track, It'd be a score from their Eccentric Objects album.
Fragments is a very industrial track indeed.
This particular score has a much more dieselpunk theme to it. It was also featured in The Matrix.
Granted, their music is a bit too industrial to be considered totally steampunk, but I think it's reminiscent of the Victorian era, as the products of the industrial and scientific revolution played an enormous role in shaping the style and fashion of the time - which is why I'd classify them as steampunk music.