I'm not sure if a thread like this was already posted but I feel as if I'd bring it up. I love 8-bit remixes of already existing songs, and I'd figure that I'd post a couple of examples of 8-bit remixes that really strike a chord (no pun intended... or maybe there was one, I dunno) with me. Share your own too, let's get the conversation a-rollin'...
"Ov Fire and the Void" by Behemoth
"I Cum Blood" by Cannibal Corpse
"Baptised in Fire and Ice" by Bathory
"Tears Don't Fall" by Bullet For My Valentine
"Ruiner" by Nine Inch Nails
"U.S.A." by the Exploited
"The Beautiful People" by Marilyn Manson
"Crawling" by Linkin Park
"The Pentagram Burns" by Satyricon
"Runes to My Memory" by Amon Amarth
Also, if there are any ORIGINAL 8-bit songs or memorable VGM tracks from old-school games that you're willing to share, pass that shit up too! Have fun!