Interesting point but I think she has collaborated before with another female jpop singer to cover a japanese song. Not sure about the title and I've forgotten that particular artist's name. But seriously I can't imagine her singing together with other japanese artists. Don't ask me why but I think that's just odd. In One Night Magic, the guy's vocals wasn't even audible enough. I understand it's featuring him but still.. haha. Even though she has worked together with a few well known english singers, those songs are not particularly famous. There's a video I saw on youtube where she met Akon and said she's interested to work with him. Well I'm definitely not a fan of Akon so I'd hate to see that happen. Oh well. The people I'd like to see Utada work with - Yoshida Brothers. Elaborations not needed because they're just awesome.