Ella is an audio analysis, search and recommendation engine for media services to understand and personalize music.
Ella provides perceptual coherent music browse and discovery through the various fields of knowledge available: context (title, artist, labels, release date, country, language, release date, popularity...), content (mood, voice presence, pitch, key, chord progression, beats per minute...), and user data (buying history, listening behavior, playlist habits...).
·REST-Based Web Service API (XML, JSON, M3U, XSPF)
·support for Debian and Redhat distros
·powered by a constantly growing song database of 16M tracks
·multi-million track capacity in 1 server
·supporting all popular media formats: MP3, OGG, MPEG, WMA, AVI...
We have found Ella to be a very compelling product. Its many options for fine tuning has allowed us to make each deployment using Ella individual to the project. 
