UVERworld is really great, their songs are amazing and TAKUYA's voice is amazing also. I really recommend them, like Hazu did.

ARASHI is that group you listen to when you want to be cheered up. A lot of their songs are really fun, catchy, and poppy. So I definitely recommend them.

KAT-TUN has been going into a more rock-ish kind of stage and if you like that, definitely try them out. Their latest album is really great, but their first is definitely the best.

Rain (Bi) is OK. Some of his songs are pretty bland, but he does have some great dance ones.

If you want really good Korean male music, then try Se7en. His voice is really passionate and strong and his songs are really good too. He also has songs in Japanese and soon English!

NEWS is good too. Most of their stuff sounds pretty generic, so if you like stuff from boybands in the 90s, NEWS is definitely a group you should check into. However, they do have some really great standout tracks - but not much. =/