Recently discovered software in Google Play Store called Yamaha Chord Tracker. It converts MP3 files to chords. Loading a file takes quite some time but it seemed to work o.k. It has a possibility to transpose. You can play along with the music. Very useful when you have a song and can't find the chords to go with it. It's free of charge, so it does have some limitations. Connect a phone or tablet to your keyboard and enjoy.