Downton Abbey star Gary Carr has replaced Anthony Mackie as the lead in a new biopic about jazz great Buddy Bolden. The actor/singer, who plays Jack Ross on the period TV drama, joins Ian McShane and Get On Up star Nelsan Ellis among the cast of Bolden, which is back after a lengthy hiatus. A long-time asylum inmate, Bolden became a student of Louis Armstrong in the 1930s and was inspired to master the cornet and trumpet. He is considered by many to be the father of modern jazz. The music for the biopic will be composed and performed by Grammy Award winner Wynton Marsalis. McShane will portray Bolden's nemesis Judge Perry, while Ellis will play the role of Bartley, the wily entrepreneur who manages the Bolden Band.