"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. The song has become a popular standard.

A moritat(from morimeaning "deadly" and tatmeaning "deed") 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 Macheathin John Gay's The Beggar's Opera. The Brecht-Weill version of the character was far more cruel and sinister, and has been transformed into a modern anti-hero.

The play opens with the moritat singer comparing Macheath (unfavorably) with a shark, and then telling tales of his robberies, murders, rapes, and arson.

The song was inserted in the play shortly before its premiere in 1928, because Harald Paulsen, who created the role of Macheath, wished a more effectful introduction of his character. The original German text is:

At the 1928 premiere, the Moritat was sung by Kurt Gerron, who was a noted film and stage actor in Germany, and who also played the part of the Police Chief Brown. Weill also intended for the Moritat to be accompanied by a barrel organ, which was to be played by the singer.

In the best known English translation, from the Marc Blitzstein 1954 version of The Threepenny Opera, which introduced the song to English-speaking audiences, the words are:

This is the version popularized by Louis Armstrong (1956) and Bobby Darin (1959) (Darin's lyrics differ slightly), and most subsequent swing versions. Weill's widow, Lotte Lenya, the star of both the original 1928 German production and the 1954 Blitzstein Broadway version, was present in the studio during Armstrong's recording. He spontaneously added her name to the lyrics, which already named several of Macheath's female victims.

The rarely-heard final verse—not included in the original play, but added by Brecht for the 1930 movie—expresses the theme, and compares the glittering world of the rich and powerful with the dark world of the poor:

In 1976 the version translated by Ralph Manheim and John Willett opened on Broadway, later made into a movie version starring Raúl Juliá as "Mackie". Here is an excerpt:

This is the version later performed by Sting and Nick Cave. It is also the version performed by Lyle Lovett on the soundtrack of the film Quiz Show(1994)—the same movie features Darin's rendition over the opening credits.

A much darker translation by Robert David MacDonald and Jeremy Sams into English was used for the 1994 Donmar Warehouse theatrical production in London. The new translation attempted to recapture the original tone of the song:

The song attributes many crimes to Macheath:

The arson, rape and disappearance of the cabbie were omitted from the original cast recording of the Blitzstein version, but remain intact in the libretto.

"Mack the Knife" was introduced to the United States hit parade by Louis Armstrong in 1956, but the song is most closely associated with Bobby Darin, who recorded his version at Fulton Studios on West 40th Street, New York City, on December 19, 1958 (with Tom Dowd engineering the recording). In 1959 Darin's version reached number one on the Billboard Hot 100 and number six on the Black Singles chart, and earned him a Grammy Award for Record of the Year. Dick Clark had advised Darin not to record the song because of the perception that, having come from an opera, it wouldn't appeal to the rock & roll audience. To this day, Clark recounts the story with good humor. Frank Sinatra, who recorded the song with Jimmy Buffett, called Darin's the "definitive" version. Darin's version hit #3 on Billboard's All Time Top 100.In 2003, the Darin version was ranked #251 on Rolling Stone's list of the 500 Greatest Songs of All Time. On BBC Radio 4's Desert Island Discs, pop mogul Simon Cowell named "Mack the Knife" the best song ever written.

Brecht's original German language version was appropriated for a series of humorous and surreal blackout skits by television pioneer Ernie Kovacs, showing, between skits, the vibrating soundtrack line.

Ella Fitzgerald made a famous live recording in 1960 (released on Ella in Berlin: Mack the Knife) in which, after forgetting the lyrics after the first verse, she improvised new lyrics in a performance that earned her a Grammy Award. Robbie Williams also recorded the song on his 2001 album Swing When You're Winning. Other notable versions include performances by Jimmie Dale Gilmore, Tony Bennett, Marianne Faithfull, Nick Cave, Brian Setzer, Kevin Spacey, Westlife, and Michael Bublé. Swiss band The Young Gods radically reworked the song in industrial style, while jazz legend Sonny Rollins recorded an instrumental version entitled simply "Moritat" in 1956. A 1959 instrumental performance by Bill Haley & His Comets was the final song the group recorded for Decca Records. Tito Puente also recorded an instrumental version. Salsa musician Rubén Blades recorded an homage entitled "Pedro Navaja." Brazilian composer Chico Buarque, in his adaptation of Threepenny Opera( Ópera do Malandro), made two versions called "A Volta do Malandro" and "O Malandro No. 2", with lyrics in Portuguese.

The song has been put to many other uses. American parodists the Capitol Steps used the tune for their song "Pack the Knife" in their 2002 album When Bush Comes to Shove. In the mid-1980s, fast food giant McDonald's introduced "Mac Tonight", a character whose signature song was based on "Mack the Knife." Comedian Steve Martin famously parodied "Mack the Knife" in his opening monologue to the premiere of Saturday Night Live'sthird season in 1977.

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