Yasiin Bey (A.K.A. Mos Def) will be releasing a Muhammad Ali tribute this Friday (Jan. 17th), which is the boxing champs 72nd birthday.
 Now, a lot of people have been waiting for Mos Def to release music.
 Could this be it??
 He is only teasing us, so we don't know if this could be a tribute song or what.
Check it out...