Even if it's not 100% accurate I find this amazing:
"Chorddetector is an mp3/wav-player with an integrated chord detection engine. Just load the song whose chords you’re interested in, press play, and off you go! Chords will be displayed in realtime, so you can play along live with your instrument."
Cost: $15 with a demo available here.
Have you tried the Chord Detector iPhone app www.chord-detector.com
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