When the great post-punk revival hit radar screens in the early aughts, who would’ve thought that Bloc Party would prove more durable than telegenic peers The Strokes and Franz Ferdinand? But Bloc Party’s longevity hasn’t always been secure. The band’s lengthy hiatus since its 2008 LP, Intimacy, has led to rumors of their demise. Said rumors weren’t helped by the band members’ rather permanent looking extracurricular activities, including front man Kele Okereke’s acclaimed electro-dance album, The Boxer. Now touring in support of its new LP Four, Bloc Party won’t say whether the album’s title stands for the four year duration of its hiatus. For the most part, Four is a return to the angular Gang-of-Four-inspired art-rock and heartfelt Boy-era-U2 big guitars which made Bloc Party’s 2005 Silent Alarm LP so bracing. That signature sound is key to Bloc Party’s staying power. True, they could be as addictively dancey as class of 2005 peers The Rapture or as fractured and wiry as Maximo Park, but Bloc Party have always been a straight ahead commercial rock band, as heart-on-sleeve as Simple Minds but minus the pomposity. As the jittery, gooey pop of current single “Octopus” proves, Bloc Party hasn’t lost its touch.