For me, it was getting some external server to forward all requests on to that port.
I realize you can use ssh -Rport:host:port as well (through some other server), however ssh tunnelling was at times interrupted and didn't have a retry or restart, it seemed, at least that I knew of.
Anyway the final forward was:
1) create new subdomain that will forward it on.
2) edit apache's conf [apache.conf in my example] to forward things on
Allow from all
ProxyPass / http://audio-mp3.ibiblio.org:8000/
3) install forwarders:
sudo a2enmod proxy
sudo a2enmod proxy_http
4) restart apache
5) enjoy the tunes [in my case].