—So you think that music killed these people?
—Not music per se. Could you help me with this please, my dear?
—What about this? Would that work?
—Figaro? Perfect!
—We’ve known for some time that different sounds affect the brain in different ways.
—Look at my brain waves on the monitor.
—They’re smoothing out.
—Harmonic music reduces neural activity.
—Which is why we think more clearly when we listen to it, as opposed to this… Dissonance. Look… Look at my neurons.
—We get it, Walter. Can I turn this off now?
—Oh, sorry. You see, the point is this, that with this type of auditory phenomenon, taken to its ultrasonic extreme, can be fatal, and the way it affects the brain, it could well have induced some type of vegetative trance before death.
—Which would also explain the trauma to the inner ear.
—So we’re looking for some kind of deadly music box?
—No, it’s ultrasonic, so you wouldn’t be able to hear it, the frequency’s too high.
—Silent but deadly.
Fringe, episode 2 season 3.