It’s rare these days to find a hip-hop group that provides sustenance for mind, body and soul. Usually, it’s one or the other - there are plenty of rap acts who make dance floor bangers, which unfortunately, requires you to check your brain at the door. And there are probably an equal number of rappers who spit intelligent rhymes over underwhelming beats.

But not only do Oakland duo Zion-I engage listeners on a physical and mental level, they maintain an urbanized spirituality, which is indeed uncommon throughout the entire rap genre. Producer Amplive balances bassy, boom-bip beats, electro-inflected rhythms and more esoteric, ambient sounds. Meanwhile, emcee Zumbi toes a lyrical line that allows for basic call-and-response exhortations as well as touching on social, cultural and meditative themes.

In the past decade, Zion-I have gone from newcomers to standard bearers of Bay Area hip-hop. In that span, they’ve been one of the most consistent local act in the genre, earning a national and international reputation for high-energy live performances while amassing a prolific, eclectic and distinguished body of work, which includes five studio albums and numerous side projects - mixtapes, solo albums, Japan-only releases, even a Radiohead remix album. In addition to collaborating with many local artists, including Codany Holiday, Mistah F.A.B., Too $hort, Del tha Funk Homosapien, Pep Love, Traxxamillion, Kafani, Los Rakas and K.Flay, they've also worked with nationally-known acts like Linkin Park, Brother Ali, Talib Kweli, Aceyalone, Chali 2na and Aesop Rock.

Their versatile range runs the gamut from backpack to hyphy to alternative, with excursions into folk, blues, soul, reggae, rock, electronica and other hybrid forms of aural experimentalism. Most importantly, they’ve engineered an original, authentic and accessible sound without lapsing into overly-commercial clichés.

Ever forward-thinking, Zion-I have always seemed slightly ahead of the curve. In 2000, years before dubstep even existed, their hip-hop/drum‘n’bass mashup “Inner Light” brought together rap and dance music heads under one banner. Three years later, on "Deep Water Slang," they sampled nature sounds, foreshadowed the retro-electro trend on “Cheeba Cheeba” and “AEIOU” and equalized hip-hop’s gender-imbalance on the neo-soulish “Flow” (featuring Goapele) and the future-folkesque “Fingerpaint” (featuring Susie Suh).

In 2005, during the height of the hyphy era, they not only updated the roots of black music with the sublime “Oh Lawd Blues,” but united the various strands of the local rap scene with the anthem “The Bay” (whose remix featured Clyde Carson, Turf Talk, San Quinn and Casual - representing the 510, the 415 and the 707 area codes).

Their classic 2006 collaboration with the Grouch, "Heroes in the City of Dope," similarly spanned numerous stylistic templates while building on a core sound, and in 2007 when everybody was going dumb, Zion-I and Too $hort told listeners, “Don’t lose your head.”

Last year's "The Takeover" had a heavy electro feel, as evidenced by the single "Antenna," which wrapped Zumbi's plaintive testimonials around oscillating synths, pulsating basslines, four-on-the-floor tempos, and a repeating vocal sample ("make me feel brand new  ..."), evoking a deep house-meets-hip-hop vibe.

But all of that was just prelude.

Zion-I's latest effort, "Atomic Clock," is arguably their best, most complete work to date. The title suggests a precise instrument fusing elemental forces with technology, which is also an apt description of the material contained within.

Amplive’s production integrates all the best bits of his previous efforts while adding new levels of sonic intrigue and nuance, while Zumbi’s flow, delivery and intonation is equally masterful. The maturation of his voice has become more evident with each album, yet he’s always been a rapper who's combined consciousness with just enough of a street edge to not sound corny.

During an invite-only, pre-release listening party at the New Parish, attendees were treated to a full preview of the new album, as well as opening sets by DJ Platurn and Bang Data, plus a mini-set by Zion-I and a freestyle cipher featuring Zumbi, Deuce Eclipse and D.U.S.T.

The new songs sounded awesome in the New Parish’s relatively intimate, yet expansive environs. It was particularly insightful to see the audience’s reaction to the unfamiliar tunes: Heads started bobbing instantaneously and bodies soon followed. Yet with Zion-I, it’s not just about quality production and dope beats. It’s also about the content and substance of the lyrics, and their ability to evoke emotions and set moods.

For example, take this snippet from "4U," which shows the nimbleness of  Zumbi's stream-of-consciousness flow: "This is real top ranking, plus I keep thinking/ How the streets keep sinking in the soil of the pavement/ Rock-a-bye baby, follow me in a spaceship/ Race for the future in the comfort of the ancient."

The album’s biggest “buzz track” is the reggae-flavored “Many Stylez” (featuring recent tour mates Rebelution). With its message of unity - praising Jah and burning Babylon over a bubbling, dub-flavored electro-groove - “Many Stylez” could easily be a ‘80s King Jammy’s production, were it not for Zumbi’s irie Oaksterdam inflections.

Thankfully, the other tracks on the album are just as good. Highlights - and there are many - include the minimalist thump of “Always;” the propulsive Afro-naut thrust of "4U;" the fist-raising chorus of “The Sealing;” the militant handclaps, sub-bass and strident horns of “Signs of Light;” the uptempo soul-hop of “Girlz” (featuring Martin Luther), the moody introspect of “North Star;” the strident ode to surviving urban adversity, "The Sun Came Out;" the lesson-laced “History;” and the metronomic instrumental closer, “Auto Automic.” Basically, the whole thing hella slaps from top to bottom.

Overall, it all works on at least a couple of levels: as an introduction to the Zion-I sound for newcomers and for longtime fans, an extension to the solid foundation they’ve built over the past decade. While compelling on first listen, the album’s musical and lyrical depth continues to resonate, inform and inspire with each subsequent play. With "Atomic Clock," Zion-I’s time has finally come.