Guitarist Ranger Doug, "Governor of the Great State of Rhythm," sings lead and baritone vocals with an ever-present big grin and warm twinkle in his eyes. A yodeler of breathtaking technique, he is also an award-winning Western music songwriter in his own right--and a distinguished music historian whose 2002 Vanderbilt University Press book "Singing in the Saddle" was the first comprehensive look at the singing cowboy phenomenon that swept the country in the 1930s.