This has never worked for me.

One weekend, back in college, my roommate and I had Take Me Home, Country Roads stuck in both of our heads for an entire weekend. At first, we tried to smoke it out by playing it once, no dice. Then we tried to nuke it by blasting it on repeat, full volume, for a long while. The two of us were still humming it the next morning. We just accepted our fate and it went away by Monday.

Not op but have a similar "problem". Straight up an earworm machine over here. But I can control it for the most part

Meditation is not my thing but if the song is getting annoying or too repetitive on a certain part I will intentionally try to distract myself. I certainly do have a monologue that reads, speaks, etc "out loud".

It only takes until i at least know a portion of the song enough to be able to sing along that I can play the majority of it ( as long as I don't get stuck in what I call a lyrical loop where one verse will tie back to an earlier one). It always sounds as is, with the band as well. Even if I don't know the lyrics I can hear the mumblings of that part.

1. Sure, but this just replaces the music with the sound of my breathing. There's always something in my brain. The only meditative peace I can get is in a flow state e.g. working out.
2. Yup, damn near always. Yak yak yak goes the brain.
3. Usually just vocals unless I focus on the music, or if it's instrumental then I hear everything.
4. Music that I can play in my brain on demand is usually music I listen to all the time already, with some exceptions. Don't have exact data on this, but it depends on context - if it's my favorite band then it'll stick around after 1 listen. If it's someone else or music I dislike it may take several listens.
5. I play The Axe by which I mean a ukulele. Not particularly well IMO but it's fun and relaxing.
6. I don't think so, but I can identify most songs I've heard before pretty quickly if I know the band or song name. It's like an involuntary Shazam.

My most played songs are peeping tom by jamie berry, genesis by justice, lone digger by caravan palace and thousand griefers; now i'm curious about what would happen

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.