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The Mufin Player recommends similar songs based on an audio analysis, but the first beta version has a litle trouble identifying song information from iTunes.
Scientific music search tool Mufin opens up and launches its iTunes plug-in for sorting through your music for recommendations.
Discover new music with Mufin, a service that analyzes music tracks to find similarities in tempo, rhythm, and density.
I like b-sides is a new service that scours your music library and tells you less popular, but still good music tracks worth your hard earned dollars.
Taste Kid is a tool that lets you find new music, movies, TV shows, and book recommendations based on what you like.