If you are similiar to my age then I am sure you are missing the old times where Commodore64 or Amiga was rocking the world.
The scene is still active and there are tons of cool music flooded with mods which are all available for free. For heavens sake there is no need to have an emulator running Protracker or other derivates inside.
Sven Janssen took the time to create a free module player in Cocoa natively for Mac OS X named CocoModX which really runs excellent.
Some Module resources for you:

I have found the HVSC (High Voltage SID Collection)!
A group have collected more than thousand SID-Files in a great arrangement!
Here is the Link:
http://www.hvsc.c64.org