I love Linkin Park. Screw that people they don't make good songs.

Mindf*ck.

Oh well, S3RL is my favourite artist atm.

I'm not gonna to tell every artist I like... but

Linkin Park
Celldweller
Red Hot Chili Peppers

etc.

Rush
Iron Savior
etc

Fall Out Boy Alternative Rock
Mayday Parade Rock, Pop-Punk
Linkin Park Alternative Rock
BACK-ON J-Rock
supercell J-Pop/Doujin music group
Pendulum Drum and Bass
x3

Nintendo's composers
Carrie Underwood
The stuff composed by NAOKI and jun is also awesome
chatmonchy, yeah
PSYCHIC LOVER, BABY! <-- definite favorite artist right now

That's all I can think of right now, really

In his good old times, Linkin Park was a Nü Metal band... I miss that old times.

They always changed their style. IMO Minutes to midnight and A Thousand Suns aren't so bad like people says.

Katy perry, Lady gaga =D I got more, but I love this 2

Skillet (....Its catchy, ok?)
Linkin Park (Back when they were good)
NAOKI
Tsukasa

HIM

Soad /o/

Rush
CLOCKWORK ANGELS JUNE 12!!
!!!

Blue Man Group
I mentioned them before.
They are a group of BOSS composers/performers that need to be experienced live.
Not sure how many people have heard their music before so...yeah.

Edit
Souleye
Can't forget about Souleye!

I guess it'd be Billy Talent for me when it comes to bands.
Also some VGM composers like Shoji Meguro or Daisuke Ishiwatari. I guess that's about it.