Raspberry Pi: Run Webserver and Subsonic on same port

[insekticide]

Hi Everyone,
since there are alot of places where everything but port 80 is blocked via the company firewall, I would like to run Subsonic alongside my Apache webserver. I am looking for something like:

http://www.mydomain.com/ - Webserver
http://www.mydomain.com/subsonic - Subsonic music service

I want to set this up an a Raspberry Pi so how it works on an PC will not help me much.

Thank you very much for your help.
- Insekt