ESPboy System Beeps is a port of the original System Beeps music album. Original System Beeps in the form of an MS-DOS program that features Shiru's original music composed for PC Speaker. You can run it on any MS-DOS compatible machine with 8088 or better, and listen to some music in the glorious monophonic square wave. All that you hear here was perfectly possible back in the day on the early XT class machines.

Bandcamp: https://shiru8bit.bandcamp.com/album/system-beeps
An in-depth 'making of' article: https://habr.com/ru/post/439192/
Support Shiru in doing more stuff like this: https://www.patreon.com/shiru8bit