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Explanation: John Brown was a US anti-slavery activist who attempted to raise a national, armed slave rebellion in the USA to end slavery once-and-for-all. Unfortunately, between the vastness of the task and a series of unfortunate hiccups in the plan, it never really got off the ground, and he and his anti-slavery forces were captured by troops led by Robert E. Lee, a then-US officer (later the leader of pro-slavery Confederate forces during the US Civil War).
John Brown was tried by the state of Virginia for "treason" against Virginia (where he attempted to start the rebellion), and hanged, evoking widespread outrage in the North, and increasing tensions between the pro-slavery South and the anti-slavery North over the next two years. Eventually, this would end with the eruption of the US Civil War over the issue of slavery, and the anti-slavery North would radicalize over the course of the war, eventually resulting in the abolition of the race-based chattel slavery that John Brown died attempting to abolish. o7
"John Brown's Body" was a popular militant abolitionist song sung by troops during the US Civil War honoring John Brown's martyrdom, and proclaiming the desire to finish John Brown's sacred task of ending slavery.