Hi,
while looking through some of my old Amiga programming disks, I found this. It's a track I made in 1989 for a game project that was never completed. It uses a custom 68000 assembly music player.
All code and sample files needed to build the player can be found here:
https://github.com/a-dietrich/Amiga-Music
And here's a recording made with WinUAE (fliter switched off)
Zyrcor.mp3.zip