An easy way to play music on any mobile device in your home is to use the DLNA service. Copy your music into a directory called "/Music/" on an unencrypted USB thumb drive and then insert it into a USB socket on the Freedombone system.
ssh into the system with:
#+BEGIN_SRC bash
ssh myusername@mydomain.com -p 2222
#+END_SRC
Select *Administrator controls* then *App Settings* then *dlna*. From there you can choose to attach the drive.
The system will scan the /Music/ directory, which could take a while if there are thousands of files, but you don't need to do anything further other than perhaps to log out by selecting *Exit* a couple of times.
The DLNA service will only work within your local home network, and isn't remotely accessible from other locations via the internet. That can be both a good and a bad thing. Another consideration is that there are /no access controls/ on DLNA services, so any music or videos on the USB drive will be playable by anyone within your home network.