For J-Rock/J-Pop
Acid Black Cherry
Breakerz
Janne Da Arc
Daizy Stripper
An Café
Garnet Crow
Scandal
For K-Pop
Boyfriend
KARA
And Um, that's it. I have way more other artists, but these are just a few. Um, I can't think of any Western bands that I like. Maybe 98 degrees? (Though, the only song I listen to from them is "Fly with me" which is from Pokémon the first movie soundtrack that I own. But now that I think about it, I like every single song on that Soundtrack.)
Yeah, so I'm more of a Japanese music kind of person. xD