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We hadn't seen this one before: OneLlama is a music discovery and playlist-sharing site with a neat Flash app that lets you explore related artists in a tree diagram. Well actually, it's a technology that uses "proprietary acoustic analysis, cultural analysis and trainable machine learning algorithms" to source related tracks: onellama.com is just the consumer-facing demo of that technology. And unfortunately the consumer side is lacking: unlike Last.fm and Pandora, only track previews are available, not full songs.
You'd imagine that with the right licenses, they could use the tech (it's very good) to serve up a convincing rival to music recommendation sites. Instead, they're going a different route: today, they're announcing a deal with APM (a joint venture of EMI Music Publishing and Universal Music Publishing), to develop a software solution for "advanced music searches and automated classifications". Those navigating the EMI and APM catalogs, then (mainly producers of film, tv, videogames, promos and commercials - not you and me), will have a much easier time finding appropriate tracks to accompany their visuals.