ZX Spectrum 1-bit music: Chronos (Tim Follin, 1987) 

ZX Spectrum 1-bit multichannel music by Tim Follin. No disturbing AY chip drums. Recorded from the real hardware.
Yerzmyey says about 1-bit music:
Many people think that attaching AY chip into ZX Spectrum was a regress. AY has only 3 channels of sound and pretty simple square wave based synthesis, whereas music generated by Spectrum's native sound-source, the Z80 chip (with help of ULA chip) was expandable to even 8-10, even 12 channels (software mixing) and it was able to generate really interesting envelopes.
This music has been written by Tim Follin. I strongly doubt it would sound good on 3 channels only and simple square-wave synthesis.
What is interesting, he has never made such great songs for any other music-chip or other platforms.
And I say:
TIM FOLLIN IS A GENIUS!