Thank you, Boroda, for your tip!
However, notwithstanding Subsonic being a great tool, it does not quite do what I would like to have.
What I would like to have would be using my android phone as a remote control for the MusicBee program on my computer - with the music being streamed to my android phone. I would like to use the full functionality of the MusicBee installed on my computer (especially the search functions for my library and the Auto-DJ) on my phone - with the music being streamed there.
What the Subsonic plugin does, however, - as far as I got it - is making your Subsonic drive visible in MusicBee. But that would only help my if I would be accessing my music with another computer, where I would install a second version Musicbee. But it does not help me on my phone.
Or did I get the functionality wrong?
Thank you very much for your tip again!