There’s a sour note in the legacy of bluegrass music legend Bill Monroe, as the man who runs an annual festival in Monroe’s honor is locked in a legal battle with the county over who gets to use Monroe’s name.

Campbell “Doc” Mercer can’t use Monroe’s likeness or name to promote The Jerusalem Ridge Bluegrass Music Festival, which he puts on annually to honor the “Father of Bluegrass.”

Ohio County and the county industrial foundation lay legal claim to Monroe’s name and image, having bought the usage rights from the musician’s son 13 years ago....