On Saturday morning the inestimable Molly Friedrich dropped me a note with a link to an MP3.  I was entirely unprepared for the awesomeness that lay behind that link, Professor Auerbach's Attack of the Steampunks Rap:

Meeting the opposition like a hammer on an anvil
Conquering the culture like a visionary vandal

Buckle up your boots and adjust your brass goggles
Check the meter, pull the level
Activate the power toggles
Hold your head up high
Let your flag unfurl
The steam pressure power punks are taking over the world

The Professor asked me to note that the beats used are Creative Commons samples from Freesound.org and just in case here's an alternate source for Attack.