I'm pretty sure there are a lot of musicians that could cause significant psychic damage by themselves.

Han-Tyumi the Confused Cyborg is literally about a cyborg who becomes obsessed with the idea of regaining his humanity, and in his pondering he realizes that in order to become human, he must become sick and then die. So he "built a machine, a human machine, made out of steel and soy protein. Born from a test-tube and into a vat; to live and to heave, and then die, just like that." His human soy-munt machine rejects his authority, questioning what kind of sick god would create an intelligent being who's only purpose is to vomit and die. So Han-Tyumi merges with his machine and finds the sensation of vomiting to be exquisite and intensely pleasurable. He proceeds to vomit until the universe is filled with vomit, the sheer mass of which collapses into a singularity.

Another one is Soundtracks for the Blind by SWANS. That whole album is disturbing. Its like a soundtrack for a top-shelf psychological horror movie that doesn't exist. Iirc the album is supposed to be themed around sexual violence and domestic abuse, especially during childhood. It features a lot of really creepy tape recordings that were taken from a box of tapes that Jarboe's father had from when he was an FBI agent. Turns out he kept personal copies of all the tapes he came into contact with, as well as recordings of every phone call in or out of their childhood home (he had wiretapped the phone because sometimes informants would call him personally). The album is creepy as fuck; I'd say the album is the only one I know of that inspires a feeling of dorcelessness.

Probably anything by Cannibal Corpse would cause some level of psychic damage (I don't personally listen to them, but I know their music can be really fucked up, even by death metal standards).

Nursery rhymes would probably straight up murder them.