The annual return of the swallows to their famous roost in San Capistrano, Calif. inspires awe and wonder aplenty. But they’re not the only avian-related spectacle to emerge from the Golden State: Instrumental post-rock act Red Sparowes has caused plenty to marvel, as well. Melding high-minded melodies with an uncompromisingly hardcore ethos, the punishing quintet has extended its range to encapsulate the trappings of both popular and underground music in one fell swoop.

Bringing its heavy epics to life one decisive beat at a time, percussionist David Clifford uses his experience with alt-rock acts, such as The VSS and Pleasure Forever, to deftly navigate the Sparowes’ increasingly convoluted flight plan. After a laundry-list of personnel switch-ups, and more recently, a record label jump from Neurot to Sargent House, he says the band is fully primed and ready to soar on gilded wings.

“We recorded the new album in L.A. with our friend Toshi Kasai,” says Clifford. “He’s a really fantastic engineer with a history of working with bands like Tool and The Melvins, and I think the quality of the end product reflects how well-versed he is in all aspects of recording. It was a pleasure to work with someone so knowledgeable.”

Tapping into that well of technical know-how, the end product, The Fear is Excruciating, but Therien Lies the Answer, sets its eight-song litany against a backdrop of cerebral thunderstorms and emotional outbursts with the incendiary power of ball-lightning.

And although somewhat jaded by its on-again-off-again love affair with the critics, Red Sparowes has somehow managed to top the existential catharsis of their previous releases, 2005’s At the Soundless Dawn and 2006’s Every Red Heart Shines Toward the Red Sun. The quest to conquer new heights continues on The Fear is Excruciating, aided by the presence of a new creative spark in ex-Nocturnes guitarist Emma Ruth Rundle.

She’s the latest pedigree in Red Sparowes, a group that includes ex-Isis guitarist B.C. Meyer and Angel Hair’s former bassist-guitarist in Andy Arahood. Clifford, for his part, says he was pleased by the addition of a sweet, young thing to the band’s characteristically apocalyptic soundscape.

“Emma has a very different style than the rest of us,” Clifford says. “Every person in this band adds their own element. In her case, it’s the fact that she doesn’t use a guitar pick or a plectrum. She has this way of using her fingers in a folk music way — it’s very intricate, and it really adds a great melodic sensibility to the mix.”

But adding a new dynamic to their lineup hasn’t softened Red Sparowes’s sound. According to Clifford, the post-apocalyptic five-piece has never been more focused in its approach — it’s still about deconstructing the myths of modern-day dystopias.

“We’ve always relied on a constant guiding principle when it comes to how we imagine the band. No matter what else changes that overarching sound remains the same,” he says. “We try keep to those lines while ideas continue to develop. Our songwriting process is inherently democratic, and therefore very time-consuming, but it generates some of the most interesting, bizarre and exquisite music I’ve ever encountered.”

And to Clifford’s semi-surprise, the music critics, bloggers and fans agree.

“Strangely enough the new album has been one of our best-received recordings to date,” he says. “Of course, the same people who gave our first two albums terrible reviews now seem to love them. Battling fear and ambiguity: I guess that’s our heroic lot in life. We produce albums that people hate and then learn to love.”