9 p.m. Monday
House of Blues, 225 Decatur St., 310-4999; www.hob.com
It's hard to believe it's been a decade since Brooklyn MC Mos Def was mighty — two questionable endeavors in the past five years and a breakout film career have taken their toll on his formerly bulletproof rep. The Ecstatic (Downtown), Mos Def's June return to the mic, is no Black Star, but it's not rap-rock either. Jay Electronica opens. Tickets $36.