Your post is a little light on details... care to expound?
Count me among the confused.
I created a LAN music server that uses Shoutcast. That way my family can serve our music library throughout our house on cell phones, PCs, smart TVs.
Until today, I only kept it to my LAN. But it is easy to port it out through my router. I have tested it on the WAN.
I do have limited outgoing/upload bandwidth.
Anyway, all of my music files are in mp3 format.