Recognizing 40-plus musical properties (e.g., tempo, rhythm, tonality), Muf analyzes whatever "seed" tune you pick, then matches it with similarly-steezed tunes from its five million+ catalog; you can then instantly preview and buy, and freely jump around results, a far more proactive experience than passive station platforms like Pandora. The technology comes from Germany's famous Fraunhofer Institute, who also developed the MP3, an invention so sick major labels Das Booted all over themselves.