The SID chip was never supposed to sound like this. Tim Follin on the Commodore 64 was basically witchcraft, pulling off progressive rock structures and jazz chord changes out of three oscillators and a filter. The Ghouls 'n' Ghosts title screen alone is worth the entire collection, this layered composition that shifts time signatures like a prog band with something to prove.
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His Bionic Commando work cycles through five levels of increasingly complex arrangements that feel more like a concept album than game music. Black Lamp's in-game track has this moody pulse that shouldn't be possible on 1980s home hardware.
The way he voices chords across just three channels is still kind of unbelievable. If you care about chiptune at all, Follin is required listening.