Evil Jingle

 is a jingle heard the first time the Doofenshmirtz Evil Incorporated building appears in each episode. Many variations exist; usually a variation is used when first changing the scene to Dr. Doofenshmirtz' location.

Background information

 * It is revealed to be sung by jingle singers in a recording room.
 * It is shown the jingle is part of a whole song Dr. Doofenshmirtz has never finished writing. This far the song goes, "Doofenshmirtz Evil Incorporated, where being evil is not debated." ("Rollercoaster: The Musical!")
 * It is revealed in the commentary of “Attack of the 50 Foot Sister” that the Doofenshmirtz jingle singers are named “The Slacks.”