A lot of people are praising MPD (Music Player Daemon) + Sonata so an article on this was probably expected.
But what is MPD and what is Sonata?
Music Player Daemon (MPD) is a flexible, powerful, server-side application for playing music. Through plugins and libraries it can play a variety of sound files while being controlled by its network protocol.
Sonata is a GTK+ music client for the Music Player Daemon (MPD).