"Mack the Knife" or "The Ballad of Mack the Knife", originally "Die Moritat von Mackie Messer", is a song composed by Kurt Weill with lyrics by Bertolt Brecht for their music drama Die Dreigroschenoper, or, as it is known in English, The Threepenny Opera. It premiered in Berlin in 1928 at the Theater am Schiffbauerdamm. 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 song was first introduced to American audiences in 1933 in the first English-language production of The Threepenny Opera. The English lyrics were by Gifford Cochran and Jerrold Krimsky. That production, however, was not successful, closing after a run of only ten days. In the best known English translation, from the Marc Blitzstein 1954 version of The Threepenny Opera, which played Off-Broadway for over six years, the words are:

Oh, the shark has pretty teeth, dear,

And he shows them pearly white

Just a jack-knife has Macheath, dear

And he keeps it out of sight.

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