EMMS (Emacs MultiMedia System) is media player software for Emacs. It is written in Emacs Lisp. The name echoes XMMS. It is derived from an earlier Emacs-based player called mp3-player. EMMS has multiple back ends to connect to external players so EMMS can support many different audio and video formats, while remaining clean and small itself. EMMS is divided into three parts, the player back ends, media sources (which can be a local file system or a network stream), and the core player.