Crossover is what happened when the punks and the metalheads stopped fighting each other in the car park and noticed they had been buying the same records. It is the least respected corner of this genre and the one that has aged best.
The definition
Hardcore punk played with metal guitar technique, or thrash metal played with hardcore's structural instincts, depending on which side of the room the band came from. Short songs, a hardcore derived beat, and a heavier and more precisely played guitar than punk had used before.
The name comes from a D.R.I. album released in 1987, which is exactly how these things usually happen: a band puts a word on a sleeve, the shops need a divider, and the divider becomes a genre.
The test
The workable distinction between crossover and thrash is not about hair or speed. It is about what the song is for.
A thrash song is an argument: built from a sequence of distinct riffs, developing, going somewhere, resolving. The pleasure is architectural. A crossover song is an event: it exists to make a room move, it is over in under two minutes, and the pleasure is physical.
The second test is the breakdown. Crossover invented the deliberate half time section written so that a crowd has something to do in it, and thrash mostly did not use that device because it was writing for people standing still and listening.
Where it came from
Both sides at once, which is why the category is so hard to police. From the hardcore side: Bad Brains, who proved the music could be technically formidable, and Black Flag, who slowed down and grew their hair. From the metal side: Anthrax and the New York scene, where the two audiences were the same people.
Geographically it happened in three places simultaneously. New York, where the hardcore and metal shows shared a crowd. Venice, California, where the skateboarders, the gangs and the hardcore kids overlapped. And Texas, where D.R.I. started before moving to San Francisco and landing in the middle of a thrash scene.
| Crossover | Thrash | |
|---|---|---|
| Song length | Under two minutes | Four to eight |
| Structure | An event | An argument |
| The breakdown | Central | Rare |
| Solos | Optional and short | Expected |
| Written for | A room that moves | A room that listens |
| Came from | Hardcore, with metal guitars | Metal, with hardcore drums |
The bands
D.R.I., who named it. Suicidal Tendencies, who got onto television in 1983 and turned into a thrash band by the end of the decade. Corrosion of Conformity, who took the southern route out. S.O.D., who wrote the rulebook in three days. Cro-Mags, who made hardcore's own heavy record. Nuclear Assault, who balanced the two better than anybody.
Behind them, a substantial second tier: Excel, Attitude Adjustment, Cryptic Slaughter, Wehrmacht, Ludichrist. And in the present, Municipal Waste, Iron Reagan and Enforced.
Why it matters
Because crossover supplied thrash with the two things it could not have invented on its own: the drum pattern that is the genre's rhythmic engine, and the idea that a song can stop when it has finished.
It also supplied a device that changed live heavy music permanently. The mosh part, a section written at half tempo specifically so that a crowd can act together, is a crossover invention, and everything about how a heavy show works now comes out of it.
And it settled an argument. Crossover is the moment heavy music stopped believing that its two audiences were different species, which is now so obvious it is invisible.
Where to start
With Nuclear Assault's Game Over, which is the best balanced record either style produced. Then D.R.I.'s Dealing with It! for the hardcore end and Crossover for the trade itself. Then The Age of Quarrel, which is the New York hardcore side making its own heavy record rather than borrowing anybody's.
The full survey of the bands is in Crossover Thrash Bands, and the wider account is in Crossover: Where Thrash Met Hardcore.
The mosh part
One technical invention from this corner of the genre changed live heavy music permanently, and it is usually described as a mood rather than as the device it actually is.
A mosh part is a section written at roughly half the tempo of the song around it, in which the guitars play a simple heavily accented figure and the drums land on the beat rather than around it. It exists for one purpose: to give a room of people something to do together.
Before crossover, a heavy song's dynamics were about tension and release for the listener. After crossover, they are about choreography for the crowd, and you can date the change almost to the record. Everything about how a heavy show works now, the way an audience waits, coils and goes, comes out of a device invented by people trying to move a room rather than make a point.
Why it was looked down on
Two reasons, and neither has aged well.
The metal audience of 1987 had spent five years learning to value musicianship, and crossover bands mostly could not play at that level and were not trying to. A genre that had just produced Rust in Peace did not know what to do with a band whose best song was ninety seconds long and had two riffs in it.
And the hardcore audience regarded the trade as a defection: solos, long hair and metal riffs were the things hardcore had been founded against.
Both objections assume that difficulty and purity are what music is for. Forty years later the crossover records are the ones that still work in a room, which is what they were built to do.
What it turned into
Two descendants, both larger than the original.
Metalcore is what happens when the crossover trade is made a third time, twenty years later, with better equipment and a different set of hardcore reference points. Everything with a breakdown in it, which by the 2000s was most heavy music, is standing on ground crossover cleared.
And grindcore is what happens when the hardcore side takes the trade to its logical end and refuses to slow down at all: shorter songs, faster drums, and the same instinct that a piece of music stops when it has finished.
Sources and notes
Years and labels refer to original pressings. The definition given here is a working one; the boundary is genuinely contested.
