 Merle Travis, Country & Western artist known for both his signature "Travis picking" guitar playing style, as well as his hit song "Sixteen Tons", was also born in Muhlenberg County.Kentucky was also home to Mildred and Patty Hill, the Louisville sisters credited with composing the tune to the ditty Happy Birthday to You in 1893; Loretta Lynn (Johnson County), Brian Littrell and Kevin Richardson of the Backstreet Boys, and Billy Ray Cyrus (Flatwoods).However, its depth lies in its signature sound—Bluegrass music.