These guys from Sweden know how to rock: Heavy metal and chiptunes, courtesy of a Commodore 64.
Here's one of their best songs.
Most of their discography can be downloaded for free on their website, which is mostly old stuff and a video game soundtrack, but most of that is awesome too. They've done a few covers including an awesome version of Britney Spears' "Gimme More" and there's even a song called "The Wired" (guess what anime it's a tribute to). If you love metal or video games they're worth a listen. 
