Musicians and singers work for years to develop their sense of pitch but few can name a musical note without a reference tone. U.S. researchers on Monday said one gene may be the key to that coveted ability. Only 1 in 10,000 people have perfect or absolute pitch, the uncanny ability to name the note of just about any sound without the help of a reference tone. "One guy said, 'I can name the pitch of anything -- even farts,"' said Dr. Jane Gitschier of the University of California, San Francisco, whose study appears in the journal Proceedings of the...