From the Simpsons episode The Black Widower, during the flashback sequence where they show Sideshow Bob in custody picking up trash, I really liked the music and always wanted to know what it was. A little research showed the sequence was a parody of the movie Cool Hand Luke. So I searched on itunes for the soundtrack and found it, it's the main title track. It's actually quite good and relaxing if you want to give it a listen.