The concept behind Return of the Gasface, the new collaborative record from Castle and Has-Lo, can be difficult to parse. Seven months ago, Castle released a record called Gasface, which was full of dense, busy production and and slice-of-life rhymes. It was very good. Then, he gave the whole album to the rapper/producer Has-Lo to remix. He liked the results so much that he decided to then re-record the entire album to suit Has-Lo’s new production. Told you it was complicated. In the end, none of that matters — this acid-tongued takedown of the minimum wage system has all the steady lean and inner darkness of early Def Jux, making it the perfect entry point into their universe.