Hey Jon! What sort of music is your bag?
I found the following webpage that has a bunch of links to streaming stations in MP3 format. I picked three at random - ones that ended "_128k.mp3" - and then dropped the URLs for them into a
playlist.m3u file in the
/boot folder, one per line, as it says in the tutorial. After a quick reboot, the stations are loaded and it all just works.
Do you have a display and keyboard hooked up to your radio? If so, then type the following in the terminal:
sudo nano /boot/playlist.m3u
Then type in the URLs, one per line. Press
enter to save and exit. Lastly type
sudo reboot to reboot the Pi.
If you don't have a display and keyboard hooked up, shut down and pop the SD card out, then pop it into a memory card reader on your desktop/laptop. It should mount a folder called
boot. Do the same as above, creating a
playlist.m3u file and drop it straight into that
boot folder, making sure that it's in plain text and not rich text format (a text editor like Notepad++ or Sublime Text is best) and that there aren't any extra extensions (like ".txt") on the end of the filename.
Let us know how you get on with that.