8 Bit Universe recently released it's cover of System of a Down's "Chop Suey" as if it was a created on an original NES video game system. It's awesome and nostalgic at the same time, especially if you played some of the darker NES classics like Contra, NARC, Castlevania, etc.
They've also done covers for other SOAD songs like "B.Y.O.B.," "Toxicity," and "Aerials."
Plus tons of other bands as well from Pink Floyd to Gorillaz.