Stinking Lizaveta - Scream of the Iron Iconoclast
Prog-Metal Instrumental from Philly. Not too heavy, but there a tint of math-rock incorporated to keep me on my toes. This is a three piece with two brothers and a female drummer who looks like she would rip your head off. Ooh, and how could I forget - the upright electric bass.
I've got a link if you're interested.
This song a bit slower, but it's live and the quality is pretty good. It's just what I'm listening at the moment. Once you click on the video, you'll be able to find more songs by them. Enjoy.