What I'm listening to today: "Bangin' Nights", gwEm
This is some acid chiptune created in 2005 for the Atari ST with the "maxYMiser music" tracker (software written by gwEm himself). Rocks hard. Depending on how you feel about harsh sounds, you'll either be enraptured or annoyed by the production; these waveforms are positively serrated.
The YouTube uploader explains this is a Atari ST conversion of a C64 chiptune by Matt Gray (composer of 80s games like Last Ninja 2).