What is the song Jim Younger is singing on the long riders on the train with bob younger?

In the film "The Long Riders," Jim Younger, played by David Carradine, is seen singing "Ain't No Grave Can Hold My Body Down" while riding on the train with Bob Younger. This song reflects themes of resilience and determination, capturing the spirit of the characters as they navigate their tumultuous lives. The performance adds to the film's atmosphere, emphasizing the bond between the brothers and their rebellious nature.