Answer:
Michael Jackson - with Billie Jean
Tina turner, Donna summer, Eddie grant (somehow?) a all aired on MTV before Michael Jackson`s "billie jean", but he is considered the first black artist to be played in heavy rotation and thus "breaking the barrier" but was not first black artist on MTV
musical youth "pass the dutchie" was the first even befor Micheal Jackson. Other black acts with a rock sound (or who tailored their sound to a rock beat) got into pre-MJ rotation as well. These include the Bus Boys ("American Worker") and Sylvester ("Hard Up").
Ross and Grant were before Musical Youth. Already checked. Look it up. They came after. Grant "Electric Avenue came out early 1982 . Pass the Dutchie, September (fall) 1982. Ross & Summer? I hope i didnt even explain that one?