services.mpd = {
      musicDirectory = "/home/guest83/music";
      enable = true;
      dataDir = "/home/guest83/.config/mpd";
      user = "guest83";
      extraConfig = ''
         audio_output {
            type "alsa"
            name "Music Player Daemon"
         }

         audio_output {
            type   "fifo"
            name   "my_fifo"
            path   "/tmp/mpd.fifo"
            format "44100:16:2"
         }
      '';
   };