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:

ssh myusername@mydomain.com -p 2222

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.