... I was thinking the same thing...
Actually, I think Eminem would be perfectly legitimate in suing Apple, as the ones selling the music. If Universal didn't own the rights, Apple could then sue Universal on those grounds... but Eminem can't sue Universal over a business deal between Universal and Apple, can they?
Am I the only one who finds it completely off base to sue Apple? Apple had the rights from Universal. Eminem claims Universal didn't have the right to sell. Therefore, shouldn't Eminem be suing Universal?