Listen to Mack The Knife (Moritat) online. Mack The Knife (Moritat) is an English language song and is sung by Lotte Lenya & Louis Armstrong and Louis Armstrong & His All Stars. Mack The Knife (Moritat), from the album Lotte Lenya: American Theater Songs, was released in the year 1999. The duration of the song is 3:11. Download English songs online from JioSaavn.