edn is an extensible data notation. A superset of edn is used by Clojure to represent programs, and it is used by Datomic and other applications as a data transfer format. This spec describes edn in isolation from those and other specific use cases, to help facilitate implementation of readers and writers in other languages, and for other uses.

Mopidy is an extensible music server written in Python.

Mopidy plays music from local disk, Spotify, SoundCloud, Google Play Music, and more. You edit the playlist from any phone, tablet, or computer using a range of MPD and web clients.