Evil Jingle

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, and he is not at the Evil Inc. building.

Background information

 * The name comes from Dr. Doofenshmirtz's reaction to the Midsummer Festival ("Attack of the 50 Foot Sister").
 * It is also 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. ("Rollercoaster: The Musical! ")