When the once dominant Rawkus Records, and the East Coast generally, fell on hard times earlier this decade, hip-hop’s underground-loving backpack brigade was left without a label to champion. Perfectly positioned to pick up the slack was an imprint from Los Angeles led by a guy who called himself Peanut Butter Wolf. Wolf (aka Chris Manak) started Stones Throw Records in 1996 when he released an album he’d recorded three years prior with his close…