I want to configure Ubuntu Server to play music from the same server, with a couple of points:
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It will not do streaming. It will play the music from the server to the speakers connected to it.
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It will be controlled by an app that offers a webpage to connect to the music list.
Best Answer
MPD will be able to do this, and also streaming if you so desired. The setup can be a bit tricky but once you figure it out it's not too bad.
Once you have MPD setup, handy wiki page here, I'd look into client175 for an interface, it has a nice and pretty fully featured web interface for MPD.