Tohoshinki. I can't recommend anything cos they're too good, but you might wanna try with The Secret Code...
One of my fav. songs from them and performance is here:
Watch all of Tohoshinki's PVs here!:
http://www.youtube.com/view_play_lis...94B6C5C8AAF33F
Hata Motohiro, he's cute, adorable and has a fantastic voice... his songs are very laid back... and some are kinda bluesy lol. You can watch all his PVs here:
http://www.youtube.com/view_play_lis...434C38F77B222C