Younha - Gossip Boy
Nana Mizuki - Secret Ambition, Trinity Cross, Eternal Blaze, Astrogation
Nami Tamaki - MY WAY reproduction
LIA - enigmatic, A Question of Honour
MELL - SCOPE
BeForU - boku no naka ni aru boku janai BOKU dake no BOKU to boku (I know it's a ridiculous title), near me.
These are the ones that have the most plays in my ipod