The music disk Apple II PT3 Player was recently uploaded to Pouet.net.
It is very nice and I recommend that you check it out. 🙂 The author has uploaded a video of the whole production on YouTube, which is great for us who does not have the required hardware to run it.
Longer demo of the Vortex Tracker PT3 player, recorded on an Apple IIe with Mockingboard card. Written in 6502 assembly language.