Try Osmium Sound in your browser
Two parts of the player, running right here: the screen you touch on the player, and the page you open from your phone or computer to set it up. The music is real, so turn the volume up.
The player's screen
The same program the player runs on its display. Browse the albums, play a track, open Now Playing and watch the VU meters move with the music. The arrow keys and Enter work like a remote.
Open
The web admin
What you see when you type the player's address in a browser: the overview, every setting, the file manager and the library editor.
OpenThis is a demo: nothing you do here reaches a real player, and what you change stays in this browser only.
The player's screen downloads about 30 MB the first time. It works best on a computer.
The music
Albums their authors made free to share, streamed from the Internet Archive.