Why Riri is not appearing in any of the 2 list?
Ohh you should make another list of the middle and artist like Riri and bitches like tranny gaga, katy perry, fergie etc would appear over there LOL!
Mazen didn't include the artists with only one proper album release in the US because of the unfair advantage, hence no GaGa, Katy, Adele, Estelle, Amy, Leona. And Lily sort of deserves to be left off this list also.