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Pro Multiple frontends available
MPD is a music player server that requires a separate client for user interaction. There are many frontends available, with the most popular being ncmpcpp.
Pro Features provide a good music experience
While mostly bare-bones, Music Player Daemon does include a few features which help make it perform well. Buffer support ensures that your music continues to play without interruption even when your system is under extremely heavy (temporary) load, gapless playback starts loading a song just before it's needed so that it's ready to play the instant the last song ends, and crossfading allows your songs to blend into one another for continuous playback.
Con May not conform to how you organise your library
MPD expects you to have all your music in a single folder (
music_directory) and use symbolic links to retrieve other resources.
Con Not a music player, only a music server
You know how you need your browser (Firefox, Chrome, etc.) to access web pages? The browser is what YOU touch, see and interface with, but in order for it to give you anything it must connect to a server that "serves" appropriate content. mpd is the server in this analogy, NOT the thing you actually use. The front-ends that are available for mpd, now those are music players.
Con Requires a refresh every time you add music
MPD won't automatically refresh it's library - if you add music to your music folder, you will have to manually tell MPD to refresh or else it won't add the new music.
Con Poor tagging support
Does not support enough tag types.