The folks over at RealHipHopHead have been doing a bunch of dope mixtape series where they do a deep dive into rarities, b-sides and features of artists. They’ve done everyone from Jay Electronica to Blu to Nas. Their most recent series features Mos Def (pre-Yasiin Bey). We hit you with the first 3 volumes a few weeks ago. Tonight, they dropped their 6th and final installment of the series. Download all 6 here. This is a must for Yasiin Bey (Mos Def) fans. Related: Behind the scenes look at the making of the Yasiin Bey (pka Mos Def) and Dead Prez tribute to Trayvon Martin (Video)