New Orleans’ poet laureate of hotboxing muscle cars has had such a ridiculously proficient run with producer after producer — Harry Fraud, Ski Beatz, Statik Selektah — that a partnership with Alchemist felt as inevitable as the sunrise. Covert Coup struck right as a post-Gutter Water Alc started indulging his cratedigger interests in increasingly esoteric international music: high-gliding Czech-rock riffage on “Life Instructions,” mournful Franco-Italian synth-disco / prog library joint “Scottie Pippen,” the orchestral score to the namesake anime “Full Metal.” The effect is that Curren$y’s casually drawled, less-casually-brilliant punchlines click like the best stoner logic.