Who sampled who? Kumi Vs. Blackberry phone?

[jpopfan]

I think its hard to say that its all Kumi or any artist who is just covering songs. I know songs like Cherry Girl and More where bought from the original composers of the songs. There are teams behind albums, songs, etc on deciding what is going to happen. She can be handed something from someone and told to perform it or given the song sample and decided to make it her own because she liked it.