1999 was a transitional year for both underground music and America’s most iconic freestanding structures.

Hearken back to when you first slapped on Calculating Infinity. Recall how completely overwhelmed you were by the Dillinger Escape Plan’s virtuosity, originality, technicality and songs seemingly designed to induce vertigo.

Liverpudlian grind titans Carcass may not have invented grindcore with 1991’s Necroticism – Descanting the Insalubrious, but they certainly opened it up to a magnitude of previously unfathomed possibilities.

Death metal was still in its infancy when Left Hand Path came roaring out of Stockholm like Satan’s official theme music—a deafening cavalcade of impossibly thick guitars, guttural vocal incantations, and gore-drenched lyrics that struck a considerable contrast—well, the guitars, anyway—to the burgeoning Floridian death-swarm (Obituary, Death, Morbid Angel) of the day.

1987 was a big year for coke-metal and bad hair: Def Leppard’s Hysteria, Mötley Crüe’s Girls, Girls, Girls, Whitesnake’s Whitesnake, and Guns n’ Roses’ Appetite For Destruction were all bum-rushing the charts like a pack of wild junkies tearing through Steven Tyler’s medicine cabinet at 4AM—which most of them were, anyway.

Northern England, 1990. Amid the cacophony of blast beats echoing from the speed obsessed world of UK death metal and grindcore, five lads from the grim North were feverishly gathering songs and ideas for the follow up to their doom laden debut album Lost Paradise.

When I was sixteen years old, I listened to four records obsessively: Metallica’s …And Justice For All …, Kyuss’ Blues For the Red Sun, the first Danzig album, and Life Of Agony’s River Runs Red—the last of which I thought was my own private musical discovery (like every other jackass with cable, I saw the video for “Through And Through” on Headbanger’s Ball).

December 16, 1996: It’s still an official day of mourning for hardcore Sepultura fans. After finishing a set at the London’s Brixton Academy, the Brazilian quartet headed backstage where an explosive band argument culminated with popular frontman Max Cavalera excusing himself from the group for good.

In May of 1995, At the Gates entered Studio Fredman in Gothenburg, Sweden, to record what would be their fourth and final full-length, Slaughter of the Soul.

Having already unleashed two merciless lo-fi shredding clinics via Show No Mercy and Hell Awaits, Slayer’s urban-Satanist lyrics and ultra-violent guitar acrobatics were far too inaccessible for West Hollywood’s coke-metal scene and way too sketchy for the Bay Area’s newly viable thrash contingency.