The late Bill Monroe, known as the father of bluegrass music, performs in Nashville, Tenn., in this June 1994 photo. The accomplishments of Monroe, who died four years ago Saturday (Sept. 9), went beyond the titanic feat of establishing his own music genre. His 89th birthday would have been Sept. 13. Admirers insist that every decade of American music since 1930, when Monroe was a memeber of The Monroe Brothers with his brother Charlie, has been touched by his genius. (AP Photo/Mark Humphrey)