Hmm here's a small list ofr starters:
American:
Paramore
Dropkick Murphys
Linkin Park
Green Day
Lost Prophets
And too many classic rock groups to name them all
Japanese:
V6 (pop)
Arashi (pop)
Hound Dog (rock)
Nightmare (rock)
L'Arc~en~Ciel (rock)
Soul'd Out (urban)
Nightwish
Within Temptation
Nickelback
Disturbed
Rascal Flatts (yes I like country)
Pink
Pat Benatar
Bon Jovi
Celine Dion
Ayumi Hamasaki
Alanis Morissette