Dear Evil Engineer: Unsafe and sound: Can I wreck havoc using sound waves?

Exploding skulls are beyond the realm of practical possibility, but there is plenty of mischief to be done through the medium of sound.

Dear Evil Engineer,

On account of a particularly contrived origin story involving a marching band, an unrequited love and traumatic public humiliation, I emerged as a villain who commits crimes using music. I have made a lucrative career, taking contracts to provide loud, aggravating, looped music for enhanced interrogation operations.

I’m interested in diversifying my business; playing songs from children’s television at captives until they beg for mercy lost its novelty long ago. Could you suggest any ways of causing physical – rather than just psychological – injury through the audio medium?

Yours,
A musical villain