Japanese rock - pop - punk
Namely: YUKI, Judy and Mary, Mean Machine, Hysteric Blue, Shaka Labbits, Number Girl, The Yellow Monkey, Aikawa Nanase, Suzuki Ami, Ohguro Maki, Kuraki Mai, B'z, and L'Arc.
It's like American rock, pop, and punk but with this special flair I like. A tad retro sounding at times, but that just makes it even better. I'm not a music guru, so I can't really pin point how it's different from American styles. It rocks. I like.
As for America tunes I tend to dig:
Green Day
Queens of the Stone Age
The Offspring
A System of the Down
No Doubt
Kittie (first album stuff only)
and... some other stuff that's slipped my mind at the moment.
