Music

The most psychologically/philosophically heavy song I know is probably the downright comically morose Kummer by Trio

Baby Shark makes every parent/ teacher/ care taker’s heart sink to the depths death metal could only dream of

A bit of a tangent, but I just saw Meshuggah this week and they are by far the heaviest band I’ve seen live (so far) in terms of sound. And Cannibal Corpse was with them on tour mind you. No other metal band (of the ones I’ve seen live) compares, and I had the stankest of stank face the entire show. I think the second heaviest live that I experienced was Tesseract.

I guess I'm not very original, but Meshuggah just beats everything else for me lately, Future Breed Machine or pretty much the entirety of ObZen (though Bleed is overrated and possibly the worst song on the album apart from Pravus), I think it's something about how the vocals interact with the riffing, though I'm not sure this is exactly the kind of heaviness you mean...

Otherwise maybe check out Flood by Boris, that has some massive riffs (Flood III is where the shit goes down if you don't feel like listening to the whole thing)

Tiptoe through the tulips by Tiny Tim.

https://m.youtube.com/watch?v=zcSlcNfThUA

Not because the song hit heavy or hard per se, but his massive balls to perform this in public create a gravity well that pulls asteroids towards earth.

Celtic Frost - A dying god coming into human flesh

Cannibal Corpse - Scourge of Iron

I'm partial to Black Sabbath's Into The Void.

Dopesmoker - Sleep

Worth a mention

Seven sorcerers - POTION

Blacklist by Exodus. Specifically their live at Hellfest 2008 version

Bloodbath - Eaten

First thing that comes to mind..

Such a tough question because I want to shout out songs across multiple subgenres. Death Grips - No Love, Primus - Frizzle Fry (especially the ending), Quo Vadis - Silence Calls the Storms, Rage Against the Machine - Settle for Nothing, Soundgarden - Jesus Christ Pose, Denzel Curry - Ultra (feat Yung Kane , Nell , Slikk , Rell), Vivaldi's Summer 3rd Movement and half of the Acid Bath or Ulcerate catalog. If I have to settle for one song though I think I would go for :

Ahab - Old Thunder

However, if I can choose a particular snipet of a song that I think is the heaviest thing I have ever heard period, I would go for Akercocke - Leviathan, between the marks of 3:30 and 4:00. I was legit scared first time I heard that. You gotta listen to it from the beggining though because that build up is insane.

Primitive Man anyone?

Check out this 12tone video which tries to analyze what makes something "heavy". tl;dr: sonic transgression https://youtu.be/b0mo17wLB4Q

Intensive Battery Brooding by Carcass

I like bass and listen to a lot of metal so. It’s all pretty heavy lol

But I’m gonna throw in the pipe organ. The biggest, loudest, most badass instrument that fills entire cathedrals and sub bass that shakes your house. Your sound system needs to be able to produce that though.

https://youtu.be/jJlZf1CRmq8

I don't know if they are the heaviest but there are two songs I keep coming back to. The first is Thrust! by White Zombie for its groove and the other is Hail Mary by Testament for pulling off heavy at a time when metal was still largely played on 9 gauged six strings tuned to e standard and no concept of bass in the mix.

Serpentine Path - Crotalus Horridus Horridus is another good one!

Beserker

I have and do still occasionally listen to much heavier music but... Nirvana - You Know You're Right, maybe with SlipKnot - Left Behind as an honorable mention

Both are EMOTIONALLY heavy for me. I don't know about heavy musically, but defo soul-crushing songs.

Sewerslvt (aka Cynthoni)'s "final" album was made so she could cope with her girlfriend's suicide. There's a music video for the last song

Sewerslvt - goodbye

https://youtu.be/hpGTkBbktx8

Torche - Barrier Hammer is a nice contender: https://m.youtube.com/watch?v=qnQ4uSGgLPw

It's hard to pick just one. Electric Wizard - Funeralopolis is absolutely a contender. Here are a few more that stand out for me:

Primitive Man - Victim (NSFW)

Katharsis - Wytchdance (the riff starting at 3:57, relentless and hypnotic. This band always made me think of Destruction but much darker)

Necrophagia - Dead Skin Slave (a little cheesy but the rhythm changes in the second half go hard)

Spawn of Possession - A Presence Inexplicable (the slowdown in the breakdown then gradual tempo increase, chef's kiss)

I'ma throw my hat into the ring with Undergang. Danish Death. The guitar tones are disgustingly creepy and the feel of the tracks is heavy as. Start with 'Tvangstanker'.