Chord Detector is a WAV/MP3 player that shows the chords live while playing a track. So you can immediately play along with your instrument while playing the track.
Not all music is suitable for Chorddetector. For example tracks with very busy drumming works less well, according to the maker. So it is advisable to try the demo first before you purchase.
With $ 15 (€ 11) the software is very reasonably priced. It’s available for Windows and Mac. Chord Detector is a product of the Dutch software maker DDMF. More information and a demo can be found on www.chorddetector.com. You can read the first reactions of users on the KVR Audio forum.