That voice. That haunting, ominous tenor of a voice is what defined Ralph Stanley. Whether he was singing a cappella or backed by the Clinch Mountain Boys, the bluegrass singer and banjo player, who died June 23rd at age 89, was able to induce chills in his listeners with just a few well-placed warbles. From the O Brother, Where Art Thou highlight "O Death" to his Velvet Underground cover, we look at Dr. Stanley's 10 best performances, both live and in the studio.Bluegrass icon Ralph Stanley died at age 89. Watch his remembrance here.