"Nine Pound Hammer" is a traditional work song that shares verses with other "hammer songs" or "roll songs," often featuring themes of prison, logging, and railroad work. These songs emerged from the forced labor system in the American South, where convicts, primarily African-American, were leased to work in harsh conditions for nearly a century after slavery was abolished. The songs often evoke the spirit of legendary railroad worker John Henry, whose "strong and valorous presence" can be felt even when he's not explicitly mentioned. John Prine, a singer-songwriter known for his blend of humor, social commentary, and melancholy, recorded his version in 1973 for his album Sweet Revenge. Playing this song connects you to a deep history of resilience and struggle.