The Threepenny Opera Official Website
This lovely site is dedicated to all things Threepenny Opera and includes a detailed history of the original German composition and the many translations and variations that later emerged. (P.S. Check out our guide, too.)
Bobby Darin Website
This is a pretty slim site, but it seems to be the best source for updates on Bobby Darin.
Rock and Roll Hall of Fame: Bobby Darin
Get a little biographical background on this bold pop star.
"The Story Behind 'Mack the Knife,'" The Straight Dope (2004)
This little column includes most everything we've told you here, but it's a little more compact and clears up a myth about the song's relationship to Detroit mobsters.