So many
Maaya Sakamoto, Fall Out Boy and Mika Nakashima are my current favorites right now.
FictionJunction YUUKA (and all the other FictionJunction projects as well), Akino Arai, The Brilliant Green, Do As Infinity, Chihiro Onitsuka, Ai Maeda (though she only has a few singles and a maxi single out), Ayumi Hamasaki, Loveholic, Lee So Young, Wax, David Tao, Joey Yung, Vicki Zhao Wei, Jacky Cheung, Sammi Cheng, Cass Phang, Kit Chan, Motion City Soundtrack, Taking Back Sunday, Something Corporate, Kay Hanley, Chantel Kreviazuk, Our Lady Peace, ect.