The EU uses a sickening and incredibly invasive ability to constantly and repeatedly repeat a piece of music, or song in your head for hours, like in
a stuck loop. Always the same few notes for hours. The objective is to attempt to render the victim's ability to reason or even, just sleep and almost
impossible task.
There was a Scottish Dr Cameron who had a clinic in Canada . I remember reading about him treating folk for backache and coming out with all manner of
mental illnesses. Can't link you anything as I'm on my phone but I'm pretty sure you'll find video's on YouTube.