Emmure vs. The Acacia Strain. It's funny because they sound pretty much the same except for the vocals. And there are diss tracks aplenty- Frankie (aka "Thanos Reignz") from Emmure gave us the line "Ask your girl what my dick tastes like". Vince from TAS threatened them with a "vanflip times a thousand".
At the very least, it's entertaining to watch two super-nerdy hardcore kids squabbling like this.
NINJA EDIT: Oh, fandom rivalries. Well, it definitely spilled over into the fandoms.
edited 16th Aug '11 5:37:50 PM by BoundByTheMoon
There are snakes in the grass, so we'd better go hunting!:wumpscut: Vs. Laetherstrip
...Ironic, considering the fact that the two love one another's work so much. (*Presumably the Fan Dumb doesn't know this*)
edited 16th Aug '11 5:39:46 PM by inane242
The 5 geek social fallacies. Know them well.in short,
- El Prodcuto & Def Jux vs. Esoteric & whatever label he's on
- Aesop Rock vs. Slug (I don't get this one, considering the two are friends)
- The Game vs. Abso-fucking-lutely everyone
- The Notorious BIG vs. 2Pac (yes, still. Even though they're both dead for exactly this reason)
- Vast Aire vs. El Producto
- Tyler the Creator vs. Hop-Sin/Hopsin/I don't know how to punctuate this. (this one is rather one-sided, though. I don't know if Tyler even knows who Hop is)
- Li'l B vs. The Entire Internet
more generally
- Nerdcore with the exception of Mega Ran vs. The Rest of Hip-Hop in its Entirety
edited 16th Aug '11 5:40:23 PM by SpainSun
I spread my wings and I learn how to fly....Most of them you'd have to visit either hip-hop forums or Youtube comments to find. There are dozens more, but those are just off the top of my head.
Oh, another one
- Eminem vs Royce da 5'9''
it's over, but it still counts. speaking of Eminem
- Eminem vs Cage Kennylz
What, we can only post fandom rivalries?
Because fuck, Taking Back Sunday vs. Brand New is the perfect example of an actual band rivalry.
Eminem vs Benzino was my favorite rap feud, just because it gave birth to "The Sauce" and "Nail in the Coffin"
Getting into more obscurity there was Anal Cunt versus pretty much everyone.
I'm fairly sure there's a fandom rivalry regarding Iron Maiden vs. Judas Priest.
With cannon shot and gun blast smash the alien. With laser beam and searing plasma scatter the alien to the stars.

TSIA. Bands that are often compared to each other.
The Who vs. Led Zeppelin
The Beatles Vs. The Rolling Stones
Cream Vs. The Jimi Hendrix Experience
edited 16th Aug '11 5:26:20 PM by Erock
If you don't like a single Frank Ocean song, you have no soul.