<Li> Frank Sinatra with Jimmy Buffett on the album Duets II </Li> <Li> 1995 Nick Cave on the album September Songs: The Music of Kurt Weill </Li> <Li> 1997 Marianne Faithfull on the album 20th Century Blues </Li> <Li> 1999 Max Raabe on the album Die Dreigroschenoper, Ensemble Modern </Li>

What is the song mack the knife about