“Mack the Knife” or “The Ballad of Mack the Knife” (German: “Die Moritat von Mackie Messer“) is a song composed by Kurt Weill with lyrics by Bertolt Brecht for their 1928 music drama The Threepenny Opera (German: Die Dreigroschenoper). The song has become a popular standard recorded by many artists, including a US and UK number one hit for Bobby Darin in 1959. A Moritat is a medieval version of the murder ballad performed by strolling minstrels. In The Threepenny Opera, the Moritat singer with his street organ introduces and closes the drama with the tale of the deadly Mackie Messer, or Mack the Knife, a character based on the dashing highwayman Macheath in John Gay‘s The Beggar’s Opera (who was in turn based on the historical thief Jack Sheppard). The Brecht-Weill version of the character was far more cruel and sinister and has been transformed into a modern antihero.The play opens with the Moritat singer comparing Macheath (unfavorably) with a shark and then telling tales of his crimes: arson, robbery, rape, murder. The song was a last-minute addition that was inserted before its premiere in 1928 because Harald Paulsen, the actor who played Macheath, demanded that Brecht and Weill add another number that would more effectively introduce his character. However, Weill and Brecht decided the song should not be sung by Macheath himself, opting instead to write the song for a street singer in keeping with the Moritat tradition. At the premiere, the song was sung by Kurt Gerron, who played Police Chief Brown. Weill intended the Moritat to be accompanied by a barrel organ, which was to be played by the singer.[2] At the premiere, though, the barrel organ failed, and the pit orchestra (a jazz band) had to quickly provide the accompaniment for the street singer.