1. SCANDAL
2. Asian KungFu Generation
3. Beat Crusader
4. PornoGrafitti
5. Uverworld
6. YUI
7. Orange range
8. Flumpool
9. Red Ballon
10. Porno graffiti

My list in no particular order .chesttap.

SCANDAL
L'Arc en Ciel
Aqua Timez
Asian Kung-Fu Generation
Namie Amuro
CHEMISTRY
Fukuhara Miho
Stereopony
And finally, my all time favourites:
Sakurakou Keionbu (K-On!)

SCANDAL
Stereopony
UVERworld
Nana Mizuki
YUI
ZONE

.clap.

Scandal
Yui
Asian Kung Fu Generation
Beat Crusaders
Perfume
Larc en Ciel
Do as infinity
Brilliant Green

My favorites are:
SCANDAL
YUI
Mizuki Nana
Hatsune Miku
Buono!
May'n

For only the japanese one here my list:

YUI
Hikaru Utada
SCANDAL
Nana Mizuki
Riyu Kosaka
Chieko Kawabe
Ayaka Komatsu
Pinkbeatz
Halcali
Bonnie Pink
Rie Fu
See-saw
Nami Tamaki

And i would add to that 3 koreans artists who got a japanese career:

Younha
BoA
TenjoChiki

my favs are..

ayaka
WaT
YUI
Ikimono gakari
SCANDAL
Koike Teppei
Yuzu
Kobukuro
NEWS
miwa

my favourite are
1.SCANDAL
2. YUI
3.Asian Kung Fu Generation
4. Porno Graffiti
5. Ayumi hamasaki
6.SIAMSHADE
7.L'Arc~en~ciel

no.7...is the spelling right?? .hmmm.

SCANDAL
YUI
ELLEGARDEN
Plastic Tree
Orange Range
Aqua Timez


.wow.

Without particular order ...

.Scandal
.The Brilliant Green
.Tommy Heavenly6
.YUI
.Nami Tamaki
.Uplift Spice
.Buono!
.Eu Phoria
.M.O.V.E
.High And Mighty Color

scandal
yui
funky monkey babys
maximum the hormone
aqua timez
nakashima mika
hamasaki ayumi
UVERworld
l'arc en ciel

..no particular order too...

L'Arc~en~Ciel
SCANDAL
YUI
VAMPS

.smile.

.here are MamiTatsuki's favorite artists~

-SCANDAL [.like..duh~]
-YUI
-Ikimono Gakari
-Tsuji Shion
-Aqua Timez
-ORANGE RANGE
-May'n
-Maaya Sakamoto
-Miho Fukuhara
-Rie Fu
-Tae Yang
-Stereopony
-Gackt
-Asian Kung Fu Generation
-Aya Hirano
-SID
-Aki Toyosaki
-Yoko Hikasa
-Satomi Satou
-Minako Kotobuki
-Tegomassu
-UVERworld
-BACK-ON

here's mine

1.maximum the hormone
2.scandal
3.yui
4.orange range
5.ikimono gakari
6.uverworld
7.gazette
8.rie fu
9.anna tsuchiya
10.stereopony

Favorite J-Artists:

YUI
SCANDAL
MARIA
FLOW
ASIAN KUNG-FU GENERATION
IKIMONO GAKARI

here's mine:


YUI
Houkago Tea Time
Aki Toyosaki (ToAki for short)
SCANDAL
chatmonchy
stereopony
Aqua Timez
Asian Kung-Fu Generation
Maaya Sakamoto
Bonnie Pink
sphere
Big Bang and BoA and Younha (when they're doing Jpop)
Flow
Round Table
Ikimono Gakari
Mami Kawada
Tsuji Shion
supercell
UVERworld

YUI
SCANDAL
L'arc~en~ciel
Tommyheavenly6
Mika Nakashima
UVERworld
The Babys
Siam Shade

no particular order

Hamasaki Ayumi*
Nakashima Mika
YUI*
Kimura KAELA
Fukuhara Miho*
Do As Infinity
Every Little Thing
Superfly
ASIAN KUNG-FU GENERATION*
chatmonchy*
SCANDAL*
FREENOTE
X JAPAN
L'arc en ciel

* indicates big fan!!

Buono!
Berryz Koubou
Morning Musume
Perfume
Nana Kitade
Ayumi Hamasaki
Versailles
High and Mighty Color
Jurian Beat Crisis
Girugamesh
Ai Otsuka
and of course Scandal.

The list could go on but I don't want to fill multiple pages [You must be registered and logged in to see this image.]

SCANDAL
YUI
Ajikan
Beat crusaders
High and Mighty Color
Bump of Chicken
Ikimono Gakari
Ho-Kago Tea Time
Maximum The Hormone
Utada Hikaru
Tommy Heavenly6

others are singles +OST~ and some vk such as ancafe, nightmare & the gazette~ XD

new to my list Sakanaction.. XP

My favorites (in order):
SCANDAL
B'z
YUI
Garnet Crow
Ikimono-gakari
ZARD
U-ka Saegusa IN db
Mai Kuraki
Miho Komatsu
Rina Aiuchi

SCANDAL
One ok rock
Bloodthirsty Butchers
Beat crusaders
Anna tsuchiya
Vamps
L'arc en ciel
Olivia
Husking bee
Aya kamiki
The gazette

SCANDAL
flow
uverworld
aqua timez
ikimonogakari
yui

my favorite

coldrain
scandal
yui
stereopony

some anime song to many to mention

my favorites artists of Japan are:

1- YUI
2- Buono!
3- SCANDAL
4- Ayumi Hamasaki
5- Girls Dead Monster (it's not really an artist, but I really like their songs)
6- C-ute
7- Hokago Tea Time (same as Girls DeMo)
8- Perfume
9- Berryz Koubou
10- Aya Hirano

and much more, that I couldn't remember now ><