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Stemage is Grant Henry, a song-writer and arranger from North Carolina. His most notable work is the band Metroid Metal, whose official website is http://www.metroidmetal.com (although he also released most of these songs as solo recordings under the name of Stemage. Note that despite last.fm's redirect, Metroid Metal is a separate artist, being a band consisting of five people, not just Stemage).
Stemage's original work is a combination of pop, metal, and 90's influenced rock. Read more on Last.fm
This gets more ‘points’ for the concept than the actual execution, although it’s not bad at all. Based on the original “Dawn of the Dead”, ‘Zero Over Zero’ is a self-described “rhythm guitar album” that’s instrumental. I can dig. It’s interesting because it’s literally like listening to a decent prog-metal album without the vocals (instead of replacing them with general wankery)—maybe best described as a less-technical Cloudkicker.