If genres were people, grime and dubstep would be twins separated at birth. In one corner, you have grime: raised in East London by DJs and MCs drawn to late ‘90s garage tempos and deep roots in Black culture, but rejected by UKG gatekeepers wary of all the youthful, rowdy energy. Inverting garage’s warmth and party-friendly vibe in favour of frigid rap minimalism and unflinching lyrics covering contemporary street life, grime stepped up to succeed garage first, appealing to listeners looking for London’s answer to platinum-charting US rap and peak Jamaican dancehall. In the opposite corner, you have dubstep: a South London-bred sound formed by a generation of DJs determined to make garage darker, dubbier and more minimal, recapturing the magic of Metalheadz-era jungle (at least until circumstances transformed their innovations into some of the highest-intensity party music ever made).

Despite their differences and any friendly rivalry however, grime and dubstep have almost always had a healthy working relationship, with crossover tunes from both becoming some of the 2000s’ most cherished bangers, tracks able to unite fans from across the musical aisle while introducing them to new ideas. Nevertheless, it would be a mistake to claim that grime and dubstep are basically the same—anyone doing so online, to this day, should expect a torrent of abuse and forceful correction by each genre’s supporters. That’s largely down to the sounds’ vastly different journeys. Grime, despite its club roots, struggled to maintain a foothold in the live space throughout its early years, first as garage purists rejected its focus on emcees and later due to the discriminatory policing of club events via restrictions like Form 696. This pushed the genre’s top collectives—Roll Deep, N.A.S.T.Y Crew, Ruff Sqwad, Slew Dem, Boy Better Know, The Movement and more—to focus on pirate radio before transitioning to mixtapes and albums.

Grime also had a testy relationship with dance music and established labels more generally: early XL Recordings releases by Dizzee Rascal and Wiley may have found critical success, but when the genre’s initial hype died down, grime artists were often left in the cold, not quite fitting in next to your average house producer but also sounding vastly different than American rappers. It’s a combination that led to the scene to double down on self-sufficiency, with grime acts seeking their own buzz and leverage before getting in bed with brands and labels. Dubstep, meanwhile, initially had no hype at all, dismissed as a fringe musical movement based out of a single record store (Big Apple) and club night (FWD>>) if it was even considered in the first place. This ability to fly under the radar became its secret weapon: in small rooms, with big soundsystems, acts like Horsepower Productions, El-B and Digital Mystikz were free to experiment and focus their sound to cater to a diehard fanbase uninterested in your average club banger.

Needless to say, no one expected the sound to gain traction and eventually become a mainstream sensation, but against all odds, that’s exactly what happened. Over the course of a few years, dubstep turned itself inside out into raucous party music, taking over the mainstream and then the world, before crashing down to Earth to once again become an underground mainstay with a dedicated community. These shifting fortunes for both genres, along with the tyranny of small musical, geographic and aesthetic differences, ensured that grime and dubstep has remained distinct—over two decades on. This isn’t a jungle/D&B situation where one sprung from the other, but nevertheless, musical and cultural overlaps persist.

The crossover between the two genres was almost immediate once the two scenes came in contact. Most obviously, South London’s Plastician—initially known as Plasticman—straddled the line between the two genres from the very start of his career, mixing and producing both MC-ready rhythm tracks and dubby club tunes. Meanwhile, grime barrers like Wiley and Skepta eventually found their way to dubstep’s homebase at FWD>>, and impressed with what they heard, began gravitating towards tracks that balanced out dubstep’s bassweight with a grime-compatible sense of melody, like Skream’s evergreen “Midnight Request Line”. Around the same time, grime tracks like DJ Wonder’s “What” (which later inspired Wiley’s “Morgue”) began embracing dubstep’s archetypical “snare on the 3” minimalism, further setting the stage for crossovers between the two genres both on radio and in the studio.

Cross-pollination between the two genres occurred in countless ways, but it usually involved an act from one camp making overtures to the other. With that in mind, it’s a bit ironic that The Bug’s “Skeng” with Flowdan and Killa P—perhaps the most impactful dubstep/grime crossover of all—has as much in common with industrial music’s textures and dancehall’s swing and patois as anything from the two genres we’re discussing. The Bug had been honing this sound for decades by the time he’d connected with Roll Deep and had his tunes played by curious dubstep DJs, and he’s never been one for sticking to genre orthodoxies.

Upon its release, “Skeng” was a huge crossover hit, becoming emblematic of a grime/dubstep fusion’s musical possibilities: darker and heavier than the former, and more vocally focused than the latter. It remains a peerless banger, able to shut down a rave nearly two decades after its release. More intentional was Plastician’s “Intensive Snare” with Skepta, a spartan, hollowed-out soundscape that made for a perfect canvas for the Boy Better Know veteran to big-up institutions like FWD>> and Rinse while introducing his voice to a whole new audience, hinting at an omnivorous musical appetite that continues to serve him well.

While these heaters brought grime’s MCs back into a club setting, other tracks provided them with opportunities to expand their topical palettes. For example, Skream and Jme’s “Tapped” tackles police surveillance, while Dusk & Blackdown’s “The Bits” allowed former Roll Deep member Trim to take a bird’s eye view to his ends, as the producers merged their interest in musical multiculturalism to grime’s rhythmic bent. By the time dubstep reached its commercial peak around 2011, such cross-genre collaborations grew so common that bloggers and record stores began to consider whether such tunes were part of a larger ur-genre, somewhat awkwardly named “UK Bass”.

Still, the best crossover tracks retained a strong sense of identity, emphasising each side of the dubstep/grime equation rather than watering things down by downplaying their differences. For a prime example of this, look no further than D&B legend Breakage’s “Hard” with D Double E, Footsie and reggae icon David Rodigan: the beat is pure dubstep and the rhymes are defiantly grimey, all while Rodigan’s bridge grounds things in the original soundsystem culture at the heart of both. True Tiger and P Money’s “Slang Like This”, meanwhile, does the same while bringing in South Asian influences and a topic that said the quiet part out loud: the specifics might change, but dubstep and grime listeners all spoke the same musical, cultural, and literal language.

The mid-2010s weren’t quite as fertile for this type of crossover, with half the dubstep scene decamping towards house and techno while the other half leaned aggro—minus a few true believers in the FWD>> sound. Meanwhile, grime experienced its first major revival, doubling down on instrumentals by producers like Wiley and Skepta rather than their South London peers. Nevertheless, continued cross-pollination was everywhere, as long as you knew where to look.

Slew Dem’s Spooky merged dubstep’s bassline emphasis to grime’s brighter palette on tracks like “Murderer”, Bristol’s Joker and East London’s Terror Danjah continued to blend a funk element to the mix on classics like “Gully Goon Estate”, and crews like Butterz and Boxed brought instrumental grime back to the forefront, attracting a dubstep audience abandoned amidst that genre’s fallow period. The concept even caught on abroad, amongst particularly open-minded artists, with Danny Brown and Scrufizzer’s “Dubstep” remaining a high-water mark as far as North American contributions go. Whether Sir Spyro’s “Topper Top”, which gave the legendary Stormin (aka Teddy Brukshot) a well-deserved hit before his untimely passing, or Flowdan, Skrillex and Fred again..’s “Rumble” winning a Grammy, the sound still has legs, even as the cultures that birthed it remain distinct.

It’s that last track that highlights the continued potential of grime and dubstep’s crossover tunes: any collab that gives Flowdan his flowers while keeping Skrillex away from EDM’s excess is undoubtedly a force for good. By the same token, you have to respect each genre sticking to its guns and refusing to merge—these types of tracks wouldn’t be nearly as special if they became the default expectation for UK MCs and producers. With both of these sounds—along with jungle, UK funky, and bass music more generally—becoming the foundation for a new generation of producers’ experiments, there’s plenty of room left for cross-pollination and experimentation: producers and vocalists just need the bravery and the innovation to make it work.