Marten Laciny and Benjamin Griffey, aka Marteria & Casper, have a lot in common: both were born in Germany but spent time in the US, where they became enthralled with glamorous-and-gritty East Coast hip-hop. No wonder they're so in sync on the dark "Alles verboten" and "So Perfekt", which alternates Casper's fierce, raspy rhymes with Marteria's more understated lyrical bursts.