Sometimes an unexpected chord change can be the difference between a good song and a great song.

Sometimes an unexpected chord change can be the difference between a good song and a great song.

The healing power of music is vast. Music therapy is in its infancy in Western psychology. If we knew more, we'd be able to do amazing things, and maybe even make permanent changes in the brain's mysterious workings. With a simple song and four chords, you might be able to do something useful, even life-changing. With all the songs you know, you might be a virtual, veritable medicine chest for the right person.