Over 50 years ago, Larry, Steve, and Rudy Gatlin started singing in their little hometown of Odessa, Texas, and from there went on to make music history. Over the course of a four-decade career that has taken the Gatlin Brothers from dusty Texas stages to White House performances, from Broadway to Grammy Awards to the top of the country charts, there has been one unifying element, music. There's no harmony quite as pure as family harmony. "Gatlin...