Hailing from the Hunters Point section of San Francisco, the RBL Posse were the first group to put Bay Area hip-hop on the map with their surprise 1992 hit “Don’t Give Me No Bammer Weed.” Fleet-footed and foulmouthed, the song was irresistible without being overly commercial. The rest of A Lesson to Be Learned cruises on an assortment of perfectly pitched samples, from Steve Miller (“G’s by the 1,2,3’s”) to Funkadelic (“B**** on the Ding Dong”). Rough around the edges in all the right ways, it’s an album that could have come only from the underground and not the industry.