Music from the PC-8801 game Herzog, composed by Naosuke Arai and Tomomi Otani. This game was developed and published by Technosoft, and utilizes a Yamaha YM2203 FM synthesis chip.
This was played using the development version of Benben v0.7.0, a high-performance open-source music player written in Common Lisp. You can find out more information about Benben here: https://chiselapp.com/user/MistressRemilia/repository/benben/