My setup is far simplified from the parent's--I simply have all my music backed up onto an external HDD that is attached to my HTPC (roughly 2TB of MP3s and FLACs). The "Music" folder is shared over the network via the Windows share option, and all of my Linux machines are able to trivially mount the directory as well using a SMB/CIFS share.

There's so little effort required that I'd barely consider it a DIY solution, considering that most of the OS's can see it and access the drive without leaving the file explorer.

I also discovered it happily continues to work when my ISP had an outage, since all of the IPs were local and still accessible provided that the router was up.