Machinæ Supremacy
I came across the band while listening to No Life radio filed under chiptune and games. Anyhow apparently this band does a lot of renditions of old games based on 8 bit consoles and the sort.
As wikipedia reads:
Self-defined as "SID metal", many of their songs use a SidStation that features the SID chip of the Commodore 64. They have released a considerable number of songs for free download on their site, 32 original recordings, with approximately 100,000 downloads a month.
And if you go on their website you got almost every song by them for absolutely free, which is really not a strange move on the chiptune market considering the zeitgeist of people on sites such as 8bit collective.