This one's a little out of left field.
"Mack The Knife" done by Jimmie Dale Gilmore.
http://youtu.be/-QDkF2VutZo
I never liked the Bobby Darin version. Seemed like second tier Sinatra shtick.
Having heard a few versions that are closer to the original, and don't portray Mack Heath as merely a swingin hep cat, rather than a killer, I really can't take the ring-a-ding Vegasy incarnations.
I guess it's just tough to figure out how to write or sing a song about a murderer.
This one replaces the creepy boho Berlin oompah of the "authentic" takes, with a seductively erie feel, along with some beautiful guitar work, and, well, Jimmie's singular singing style.
I love this.