Soundtrack albums are the schwag-weed of the rap world. They’re lousy with seeds (superfluous guest spots) and stems (obtrusive movie dialogue), and no matter how tightly sequenced the final product is, they leave the impression that someone had to stretch their supply. But if the MIA release date for Snoop Dogg and Wiz Khalifa’s ganja-fueled buddy flick Mac And Devin Go To High School is any indication, the movie is secondary to the music, and the pound-for-pound quality of the accompanying album seems to confirm that. While the sharp keys and lite Jackson 5 bounce of the Bruno Mars-aided single “Young, Wild And Free” have a disconcertingly high sheen, the rest of High School offers G-Funk from the bottom of the bong, encompassing purple horn-drenched Baduisms (“Talent Show”), rough-cut ’80s synth samples (“6:30”), and even glitchy bloops and bleeps (“Smokin’ On”).