They're entirely different. mpd is an audio daemon that plays audio. Beets is a tool for organizing/tagging your audio files. There's a plugin for Beets called

They're entirely different. mpd is an audio daemon that plays audio. Beets is a tool for organizing/tagging your audio files. There's a plugin for Beets called 'bpd' that acts like an mpd server on top of your beets audio library