"Uncle Pen" redirects here. For the song, see Uncle Pen.James Pendleton Vandiver (1869–1932) was a Kentucky fiddler, born there shortly after the American Civil War. He was uncle to bluegrass musician Bill Monroe, who immortalized him in a song, "Uncle Pen".Monroe used to hear his uncle playing fiddle on the hilltop where he lived, while Monroe put away his mules at night.