Musicians spend a good chunk of their student years just learning to listen – and listen pretty carefully. I’d say we all think we are pretty exact and can differentiate things ordinary mortals can’t…so this article surprised me!
http://www.npr.org/blogs/krulwich/2011/09/23/140704746/whats-he-saying-bahh-or-fahh-a-brain-mystery . Be sure to have your sound on when you watch.
Also worth browsing through Robert Krulwich’s writings at http://www.npr.org/blogs/krulwich/ – and not just because he’s an Oberlin grad like me.
Ray Urwin 
How could any of this be better stated? It couldn’t.