Music search and recommendation tool Mufin is opening to everyone this morning. The service, which , 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.
Note: The iTunes plug-in is currently Windows-only. You can download it here (.EXE warning). Here's what it looks like: