 Lots and lots and lots of musicians have done it just because, you know, it is such a fun theme to play and a theme that inspires, you know, great interpretation. Well, Will, we're out of time. Thanks again for talking with us on KPFK. Will Friedwald is the author of Stardust Melodies, a biography of the 12 of America's most popular songs. We spoke with Will Friedwald about Mack the Knife in August 2005.