Err if you want to hear music it is best to wait untill you have a DAC either IQdac or one connected via USB. No DAC no sound. You will also need a player i.e. Volumio, RuneAudio, Moode etc of your choosing.
I really think this will be a challenge for many AoS members who want what rPi offers but don't know how to make it work (or fix it when it doesn't).
The guy who was thinking he can sell/supply preconfigured Rpis may not have thought it through.
A warning to the curious. I work with computers and have found myself stretched. If you don't ever do more than turn your computer on and cry for help when it goes wrong it is best you think twice about what Marco is enthusing about. It may not be for you