Band-In-A-Box (BIAB) by PG Music contains an applet called the Automatic Chord Wizard (ACW) which does a pretty good job of extracting chords from audio files and translating them to MIDI. You can get more information at http://www.pgmusic.com/index.html
. BIAB isn't cheap, but there is a holiday sale which extends through tomorrow. The "Pro" package at $129 is all you would need for your purpose. Whether or not it's worth depends on how much you value your song. Good luck with your quest.
Windows 7 Ultimate x64, Reason 7, BIAB 2013
Intel i5 2500K 3.3 Ghz, Gigabyte ZX77X-UD3H, 16 Gb Corsair DDR3 RAM
OCZ 60 Gb SSD, WD 1 Tb Caviar Black 7,200 RPM HD
Zotac/Nvidia GeForce GTX 560 2 Gb, NZXT H2 "Silent" case w/liquid cooling
Presonus AudioBox USB, Behringer B2031A, JBL PSW D110 sub
Kennesaw (Atlanta), Georgia, USA
Last edited by ryszard; 2013-01-14 at 18:39.
Reason: Add information