The Melodious Malefactor

Create a villain whose signature style is deeply tied to a particular piece of music or collection of sounds.

This music or sound doesn’t just define them—it is part of how they execute their dastardly deeds. Perhaps they use it to announce their presence or to send their victims into a trance. How does this signature tune reflect their character and goals? What emotions does it evoke in their victims, and how do the notes intertwine with the villain’s malevolence?