"Flesh and Blood" is a 1970 single written and recorded by Johnny Cash and was featured in the film, I Walk the Line starring Gregory Peck (see: soundtrack album I Walk the Line). The song describes a man observing and interacting with nature, but noting that it is no substitute for a human partner; "flesh and blood needs flesh and blood." "Flesh and Blood" went to number one on the U.S. country singles chart for one week, spending a total of thirteen weeks on the chart.