Yasiin Bey aka Mos Def is coming to London’s O2 Forum for a one-off performance of the classic Mos Def album THE ECSTATIC, as well as other classic Mos Def material Mos Def really doesn’t need any introduction: Exploding into public consciousness as part of BlackStar (with Talib Kweli) in 1998, it was Mos’ debut…