I love Utada Hikaru, UVERworld, Home Made Kazoku, SunSet Swish, High and Mighty Color, Yako Kanno, Skoop on Somebody, m-flo, L'Arc~en~Ciel, Sowelu, Namie Amuro, Mia Hoshimura, Orange Range, Asian Kung-Fu Generation, and Akeboshi
Those guys are amazing! Some of them I heard from a few animes. ^^ I know that is a lot. But that is what I listened to so far.