There's now a new link "MUSIC" in the main page:
https://spectrumcomputing.co.uk/music.php
It contains all AY files from "Project AY" which was hosted on the old WoS, except now listed individually.
This is a the original page on the old WoS site (Thanks to Wayback Machine)
https://web.archive.org/web/20180828125 ... projectay/
Enjoy!