Really! NSFW
This is the video for the Japanese band Dir En Grey song “Obscure”.
It’s creepy, contains nudity, plus other deviant things.
It’s also NSFW (or weak-hearted people or the easily offended).
How 'bout Tubular Bells? This is the theme music and not the Mike Oldfield version cuz that one is minutes long-- and that’s only part one.
Also Jaws attack music.
Don’t post the full lyrics to songs, it’s not allowed due to copyright issues. I have pared down your posts.
Bela Lugosi’s Dead with cool video.
The Hearse Song
Code Blue - https://www. T.S.O.L.- Code Blue - YouTube NSFW
Ready for Freddy by the Fat Boys
It’s particularly scary when you think that the Fat Boys were actually a fairly popular act back then.
Spike Jones version of My Old Flame is goofy on the surface, but if you think about the lyrics, it becomes very creepy.
You wanna be creeped out? I give you DOA by Bloodrock
Ozzy Osborne - Mr. Tinkertrain. For the intro and also being rapey.
I think their creepiest song is Insanity.
ETA: and if we’re going for the music videos, Tool has plenty, especially “Sober” and “Prison Sex.”
It’s not a Halloween song at all, but Einstürzende Neubauten’s song “Halber Mensch” sounds creepy as hell if you don’t understand the lyrics.
That song in Harry Potter 3 sounded very Holloweenish.
You are right, of course. I read the OP as Halloweeny.
I Have A Special Plan For This World isn’t music per se, but creepy as fark because it was written by Thomas Ligotti.
For a more musical but equally unsettling piece, try Black Ships Ate The Sky
“What’s He Building in There?” - Tom Waits.
Nothing supernatural or Halloween-themed but still deeply unsettling.
Queens of the Stone Age “Burn the Witch” fits the OP’s requirements I think.
How is it not Black Sabbath? Isn’t that the definition of black, moody, creepy and metal?
I think Priest’s Night Crawler is a creepier song then The Ripper.
Not a Halloween song, but one of my favorite beautifully spooky songs (via Bob Dylan)
Here’s just a creepy instrumental/operatic one from 2001: - YouTube
Or something more rock based Misfits - Scream: Misfits - Scream! [OFFICIAL VIDEO] - YouTube
This Nick Cave tune The Carny always creeped me out. The Carny - YouTube