Bliss music library is a multithreaded C library used to compute distance between songs. It is especially usable through MPD with Blissify. It is can be useful for creating "intelligent" playlists and/or continuous play, a la Spotify/Grooveshark Radio. Bliss is really useful when used as a plug-in for audio players. WWW: https://github.com/Polochon-street/bliss