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Mufin opens up with Facebook app and iTunes plug-in

Scientific music search tool Mufin opens up and launches its iTunes plug-in for sorting through your music for recommendations.

Music search and recommendation tool Mufin is opening to everyone this morning. The service, which launched in private beta in early October, lets you find music that's similar to a track you know based on a scientific analysis of its composition.

New on Thursday is both a Facebook app and the previously mentioned iTunes plug-in that scans your library to give you recommendations. Unlike Apple's "Genius" analyzer system in iTunes, Mufin actually scans your tracks for relational relevance instead of giving you an aggregate hodge-podge of recommendations based on the playlists and purchases of iTunes users. The only catch here is that you're limited to Mufin's relatively small 4 million-song database, which is roughly half that of iTunes.

Users are also getting the option to save playlists and notes--the service's equivalent to a shopping list. Previously these would disappear between sessions, which kept it from doubling as an ad-hoc music streaming tool.

As for the Facebook application, it's little more than a widget that lets you search for tracks without leaving the social network. It does however give you a "discovery wall," which lets you share and view tracks bookmarked by friends--similar to the MySpace version that was available back at launch. If you're looking for something a little more anonymous, the Mufin team is now providing weekly recommendations for music to look out for, although you'll have to purchase them off-site.

Previously: Mufin lets you discover new music with science

Note: The iTunes plug-in is currently Windows-only. You can download it here (.EXE warning). Here's what it looks like:

The new iTunes plug-in scans your library and offers up song recommendations based on musical similarities. (click to enlarge) Mufin