I saw this on (the great) James Fallows’ blog for Atlantic magazine. It’s a four-minute rap song about Alexander Hamilton, from the perspective of Aaron Burr, the man who shot Hamilton.
It is performed by Lin-Manuel Miranda at the White House Evening of Poetry, Music and Spoken Word” last May.
PS--Republican or Democrat, you should bookmark James Fallows' blog. He's a contributor for The Altantic, and a former Carter speechwriter.