"Volumio" is a custom Linux(?) distribution specifically for the Raspberry Pi (and also some other SBCs), which essentially turns your Pi into a music-playing appliance. It can stream music from a large variety of resources, or it can play locally stored music or music on network shares.
Getting it installed was simple:
- download the zipped image file from https://volumio.org/get-started/
- unzip the image
- use dd to write the image to a microSD card
- put the SD card into the Raspberry Pi and start it up
After that, I typed http://volumio.local/ into my PC's browser, selected a streaming radio station, and ignored it for the rest of the day.
As dearly as I love Linux, this is an unheard-of experience: I know nothing about the Volumio distribution precisely because it's so easy to use. I haven't had to debug anything: it booted, it ran, it did exactly what was advertised. I'm thoroughly impressed.