2010 was a year of immense change for hip-hop. Innovative producers and MCs pushed rap to new margins, kick-started by Wayne’s rap/rock hybrid Rebirth and punctuated by Kanye’s genre-trumping behemoth My Beautiful Dark Twisted Fantasy. But for all the creative sampling, surprising collaborations and overall broadening of the rap world’s horizons, a grittier, more visceral sound dominated the cars, clubs and street corners throughout the year. It danced on the line between self parody and self reverence, and as Complex’s Ernest Baker sharply noted, it felt like “an invitation to a party celebrating the fact that music like this [was] even being made.” It was the dense, noisy, controlled chaos perfected by young producers Lex Luger and Young L and galvanized by street anthems like Waka Flocka’s “Hard In Da Paint” and Rick Ross’s “BMF (Blowin’ Money Fast)” that captured our spirits in 2010, prompting hipster mosh-pits and trapster brick sales all at once. These huge, messy, and deceptively complex records employ a pop tactic known as the “Wall of Sound,” a production technique that’s been igniting dance floors for decades. Created in the 60s, introduced to hip-hop in the 80s, and still towering today, the Wall of Sound represents a prevalent dialogue surrounding the politics of sound, and is particularly significant within the context of the hip-hop soundscape.

The Wall of Sound was first developed (and named) by influential record producer/songwriter Phil Spector, who produced over 25 Top 40 singles in the early 1960s. His girl-group pop ballads were smash hits, and all featured his trademark style of dense, layered, and heavily reverberated instrumentation. On songs like “Da Doo Ron Ron” by The Crystals and “Be My Baby” by The Ronettes, Spector had several guitar players, horn players, pianists, and bassists playing in unison, to create the sensation of an impenetrable wall of melody, greater than any of the individual instruments that contributed to it. This distinction was the crux of Spector’s revolutionary philosophy: it was not the individual pieces of a composition that mattered, but the mélange, the feel of the sound that affected listeners (he felt so passionately about this that persons in the studio who weren’t even being recorded could not leave in between takes—he feared the sound would change if the amount of people in the room did). Spector, having no formal music training himself, understood that listeners weren’t looking for certain chords or solos, but for a sonic emotion, something that represented much more than it was comprised of. Two decades later, a producer from Long Island and his loud-mouthed MC friends would take this philosophy and politicize it, morphing it from a comment on music composition to a criticism of the concept of “music” altogether.

When Hank Shocklee and The Bomb Squad began producing the tracks that would become Public Enemy’s It Takes A Nation of Millions to Hold Us Back, their self-proclaimed goal was to “destroy music.” The group’s ground-breaking sampling techniques blended countless sounds together from various records to create their own version of Spector’s Wall of Sound, one that was even less melodic and even more chaotic. Tracks like “Fight the Power” and “Welcome to the Terrordome” were structured around the natures of individual sounds instead of their positions in a sequence or harmony, and became both protest and party anthems because their emotion was not only palpable, it was inescapable. Public Enemy’s ideology—a lambasting of cultural hegemony, social and political inequalities, and the rewriting of history by the dominant class—was in essence a protest against structure, and in particular, the structure that imposed standards on who they were and what they could be. Their music was another bullet-point in their argument: why should music be structured around the systems of melody and harmony that had previously defined it? Shocklee and his team felt not only that it shouldn’t be, but that to deliver the message their group needed to deliver, it simply couldn’t be. And audiences enthusiastically agreed, flocking to record stores and concert arenas to be blasted again and again by the impossible noise of the Bomb Squad and the urgent ideals of Chuck and Flav.

It is here that the innovation of Phil Spector and the politics of Public Enemy intersect with the sweeping phenomena of trunk rattling trap music that reigned in 2010. The champion architect for today’s Wall of Sound is Lex Luger, the Virginia-born producer who at a mere 19 years of age quickly became one of hip-hop’s most sought beatsmiths. Inspired by the archetypal booms and claps of Cash Money’s mid-90s reign, Lex’s style calls forth the sights, sounds, and smells of the traphouse: dense, hot, sticky, and filled with the smoke of various illegal substances. His beats boast heavily stacked and reverberated synths, hot, sharp, rapid percussion, and impossibly thick bass, completely ignoring any semblance of melody. It’s nearly impossible to isolate and identify any one chord or melodic riff, let alone write out or recreate his beats with traditional music training. Lex beats thrive solely on energy and imagery; rhythmic tensions and melodic flare take a back seat to purely emotional sound, meant to provoke more than invoke. Each of the many times “BMF” and “Hard In Da Paint” blared across airwaves and from iPod docks this past year, it was in sonic protest of the tidal wave of over-produced, flowery pop production that neighbored it on either side. This music wasn’t catchy, it was gropey. And we loved it not for how good it was, but how insistent it was.

Few would liken Rick Ross and Waka Flocka to Chuck D and Hank Shocklee, and even fewer would connect either pair to the jukebox girl groups of the 60s. But all three categories of artist—the crude, the controversial, and the candy-coated—have recognized the strength of manipulating sounds beyond convention, making something bigger than just a song. The Wall of Sound that they all utilized becomes a symbol: both a hurdle that obstructs the listener and an overwhelming experience that engulfs them.  It’s a sonic representation of our greatest demand of our favorite music, to transport us beyond the physical plains we inhabit. Waka and Ross aren’t the best rappers, and Lex Luger isn’t the best producer, but they connected with so many people because their music was transcendent and moving. When the needle hit these records and the clubs erupted, all that loud, dense, confrontational and progressive energy coalesced on the dance-floor, becoming something that was itself greater than all of its parts: hip-hop.