I'm gonna list my top three with three favorite songs per artist:

1 hitomi - IS IT YOU?, MARIA, re-make
2 Ayu - SURREAL , RAINBOW , Unite!
3 Hitoto Yo - Morainaki , Hanamizuki , Kagefumi

Uij, I wanna make a list myself. :>

Ayumi Hamasaki
01. No way to say
02. MY ALL
03. SURREAL
04. M
05. Depend on you

Koda Kumi
01. Aisho
02. Love Goes Like...
03. Can't Lose
04. Hana
05. Ningyo-Hime

Utada Hikaru
01. Addicted to You
02. For You
03. Beautiful World
04. Flavor of Life
05. HIKARI

Namie Amuro
01. It's all about You
02. Violet Sauce
03. ALL FOR YOU
04. ALARM
05. Free

Mai Kuraki
01. mi corazon
02. Love, Day after Tomorrow
03. PERFECT CRIME
04. What are you waiting for?
05. Secret of My Heart

Hee, this was fun. :p It's funny how listen to more of female singers than males from Japan. Well, I haven't really been interested in male singers or bands yet, so that's why. :)

01. TVXQ
Songs: Choosey Lover, ON&ON, Tri-Angle
02. Cheon Sang Ji Hee
Songs: Dancer in the rain, My Everything, 5cm
03. Big Bang
Songs: Last Farewell, Big Boy, Forever with you
04. FT Island
Songs: Love Sick, Only One, Until you return
05. Wonder Girls
Songs: Tell Me, Bad Boy, Move feat.Minwoo
06. Koda Kumi
Songs: Crazy 4 U, Unmei, m.a.z.e
07. Ayumi Hamasaki
Songs: Dearest, evolution, fairyland
08. Super Junior
Songs: U, A Man In Love, L.O.V.E
09. NEWS
Songs: Hoshi wo Mezashite, Sayendou, code
10. BoA
Songs: Moto, We Wish, Revolution Code
11. WheeSung
Songs: Incurable Disease, Goodbye-luv, Love is delicious
12. AAA
Songs: Kuchibiru kara romantica, Let it beat, Chewing Gum
13. Namie Amuro
Songs: Want me, Want me, WoWa, LOVE 2000

...aaaand..I can't think of anymore. XD

ayumi hamasaki - M, momentum, Trauma, Boys & Girls, Ladies Night, evolution
AAA - BLOOD on FIRE, Red Soul, Climax Jump, That's Right, Kuchibiru kara ROMAMTICA, SHE no Jijitsu
Koda Kumi - Butterfly, m.a.z.e, real Emotion, Pearl Moon, LAST ANGEL, BUT, Without Your Love
NEWS - Sayaendo, Ai Nante, I.ZA.NA.I.ZU.KI, SHOCK ME, Chirarizumu, weeeek
w-inds. - Paradox, Still On The Street, So What?, Because of you, ROUND&ROUND, SUPER LOVER -I need you tonight-
UVERworld - D-tecnoLife, UNKNOWN ORCHESTRA, Circle, Nitro, Zero no Kotae, DISCORD

DA PUMP Circle of Life
Angela Chang Du Zhi Yin Wei Ni, Aurora, Jue Bu, Jiao Huan
S.H.E Zhong Guo Hua, Yue Gui Nu Shen, Xie Xie Ni De Rang Wo Ai Guo Ni
Hebe Tian Lai Bu Ji
TANK San Guo Lian
eVonne Hsu Gun Dan Ba Lei, 謎, Qi Yue Qi Ri Qing
Elva Hsiao U make me wanna ft. Blue, L.o.V.E, FREE, Honey Honey Honey
Stefanie Sun Someone, 奔

Top 10 Favorite Songs (at least right now)

Thomas Falke "Revolution On The Dance Floor"
Groove Cutter "My Shooter"
Control One "Just A Little Bit"
Ian Carey "Redlight"
Kevin Weg "Dead Radio"
CIRC "Destroy She Said"
CIRC "Revolution Song"
Tristan Garner "Give Love"
Icebreaker International "Port of Rotterdam"
Enya "Orinoco Flow":luv2


I tend to find pretty obscure stuff this way.: I search around on iTunes for compliation series that I feel have good selections, and then just buy whole compilations... recently I've been spending way too much money on this series -- http://electricnation2010.com/tracks:innocent

Top 10 Favorite Songs (at least right now)

Thomas Falke "Revolution On The Dance Floor"
Groove Cutter "My Shooter"
Control One "Just A Little Bit"
Ian Carey "Redlight"
Kevin Weg "Dead Radio"
CIRC "Destroy She Said"
CIRC "Revolution Song"
Tristan Garner "Give Love"
Icebreaker International "Port of Rotterdam"
Enya "Orinoco Flow":luv2


I tend to find pretty obscure stuff this way.: I search around on iTunes for compliation series that I feel have good selections, and then just buy whole compilations... :tired

i dont listen to ALOT of azn music :P
anyways.

Namie Amuro (ALOT! hm.. never end, wild, dr, baby dont cry, hide&seek, No,)
Ayu! (momentum, voyage, part of me, rule, sparkle, JEWEL..etc!)
utada hikaru (deep river, prisoner of love, simple and clean)
BoA (eat you up, eien..)
koda kumi (taboo, driving)
big bang (make love :D)

These artists aren't in any particular order, I don't rank them by favouritism since it's just too difficult :P

1. Ayumi Hamasaki - SURREAL / Memorial address
2. globe - Anytime smokin' cigarette
3. Dir en grey - 24個シリンダー / Mask
4. GO!GO!7188 - C7
5. Glay - Biri Biri Kurasshyumen
6. Hitomi Yaida - Kodoku na Cowboy / Creamed potatoes
7. Namie Amuro - A Walk in the Park / I Have Never Seen
8. X Japan - Endless Rain / Desperate Angel
9. Zwei - Dragon / 24/7
10. Shiina Ringo (<3) - Yatsutsuke Shigoto
11. M.O.V.E - Noizy Tribe / 7 Days of Love
12. Kyosuke Himuro - NO MORE FICTION
13. miyavi - ♂パパママ♀～望まれヌBaby～ / 常勝街道
14. TM NETWORK - 1974
15. Nightmare - the WORLD / the LAST SHOW
16. L'Arc~en~Ciel - Be Destined / Singin' in the Rain
17. Judy and Mary - Power of Love
18. Ai Otsuka - U-Booto / Futatsuboshi Kinenbi
19. Yum!Yum!Orange - Yellow Halloween Night
20. W - Senti-metal boy

I'll stop there. I just thought of the first songs that came to my head when I thought of each artist :P Writing lists of songs for all my favourite asian artists takes up so much time O_O. I may add to the last at a later time lol

01. Ayumi Hamasaki - Moments, Memorial address ~take 2 ver.~, Endless sorrow
02. Namie Amuro - ROCK STEADY, Come, No
03. HIGH and MIGHTY COLOR - ZERO SYMPATHY, OVER, all alone
04. Do As Infinity - Kuusou Ryoudan, Heart, Na no Hana Batake
05. Leah Dizon - Ai Shiteru~Love Story, Missing, Under The Same Sky
06. chatmonchy - Renai Spirits, Real,
07. Yu Yamada - REAL YOU, little raindrop, cosmic ride
08. alan - Gunjou no Tani, Kagome, Sora Uta
09. ASIAN KUNG-FU GENERATION - Kimi To Iu Hana, Mugen Glider, Natsu no Hi, Zansou
10. Aqua Timez - 1mm, Ayumi, Kibou no Saku Oka Kara
11. Ikimono Gakari - Nisemono, Hana wa Sakura Kimi wa Utsukushii, Hingeshi
12. Eri Nobuchika - Yume no Kakera, SING A SONG, Inner Glow
13. Ami Suzuki - climb up to the top, FREE FREE, Ai no Uta
14. YUI - How crazy, Laugh away, Driving today
15. UVERworld - SHAMROCK, Hitori Janai, Shaka Beach ~Laka Laka~
16. Ai Ootsuka - tears, Planterium, Cherish
17. Nami Tamaki - Get Wild, Kura Yami Monogatari, Brightdown
18. Nanase Aikawa - midnight blue, Ai no Uta -Magenta Rain-, FOOLISH 555
19. the GazettE - Chizuru, Bathroom, LEECH
20. Dir en grey - Ain't Afarid To Die, Saku, Lie Buried With A Vengeance
21. Satomi Takasugi - Tabi Bito, Soshite Boku wa Tohou ni Kureru
22. Nana Tanimura - Ooh..., Place Of Love, JUNGLE DANCE
23. BUCK-TICK - Gensou no Hana, Snow white, Inori (Rakuen)
24. 12012 - Butterfly
25. ayaka - I believe, Te wo Tsunagou, Jewelry day
26. Emi Hinouchi - chocolate, Ai Dake ga, Painful
27. ORANGE RANGE - ne pyom pong, Soy Sauce no Theme, Walk on
28. Rie fu - Tsuki Akari, Life is Like a Boat, Vintage Denim
29. OLIVIA - Fake Flowers, Denial, Skip to a Little #
30. Anna Tsuchiya - SLAP THAT NAUGHTY BODY, Kuroi Namida ~deep sadness version~, Somebody Help Me
31. Younha - Orange no Hatsu Koi, Ai Ai Gasa, Te wo Tsunaide
32. abindgon boys school - Via Dorolosa, Nephilim, HOWLING
33. girugamesh - Kowarete Iku Sekai, Fressia, Jarring fly

01. L'Arc~en~Ciel - Dearest Love, MY HEART DRAWS A DREAM, Shout at the Devil
02. Ayumi Hamasaki - RAINBOW, Memorial Address, alterna
03. Miliyah Kato - Ms.Jealousy, Cry no more, Kono mama zutto asa made
04. Tohoshinki - Rising Sun, Doushite Kimi wo Suki ni Natte Shimattan Darou, Choosey Lover
05. Koda Kumi - Selfish, BUT, Rain
06. Namie Amuro - never shoulda, Put 'em up, WANT ME WANT ME
07. UVERworld - Gekidou, PRIME, GROOVY GROOVY GROOVY
08. alan - Shiawase no Kane, Gunjou no Tani, Sora Uta
09. HIGH and MIGHTY COLOR - ROSIER, for Dear, Tsumi
10. KOTOKO - Re-Sublimity, We survive, Crossed Destiny
11. Utada Hikaru - Hikari, Deep River, Eternally
12. Acid Black Cherry - Koi Hitoyo, Shoujo no Inori, SPELL MAGIC
13. OLIVIA - Celestial Delinquent, Denial, a little pain
14. melody. - Believe me, READY TO GO!, Deja vu
15. Aya Kamiki - A Constellation, MISEKAKE no I Love you, Pierrot
16. Anna Tsuchiya - Lovin' you, Somebody Help Me, Kuroi Namida ~deep sadness version~
17. Yuna Ito - JOURNEY, alone again, I'm Here
18. Miz - Confusion, In The Rain, You Can Do Anything
19. Big Bang - Number 1, CRAZY DOG, So Beautiful
20. NEWS - DREAMS, SHOCK ME, Hadashi no Cinderella Boy
21. Lee Hyori - Get Ya, U-Go-Girl, Dark Angel
22. Leah Dizon - BxKxRxxx, Are you feelin' for me, Love Paradox
23. BoA - VALENTI, MOTO, Dakishimeru
24. Baby V.O.X - Wishes, Loveless, What Should I Do
25. KAT-TUN - RHODESIA, Bokura no Machi de, DON'T U EVER STOP
26. AAA - Samurai Heart, Let it beat, That's Right
27. Ami Suzuki - Fantastic, FREE FREE, Delightful
28. Nami Tamaki - Brightdown, Heroine, Believe
29. ayaka - I believe, Mikazuki, Ai wo Utaou
30. Jolin Tsai - Overlooking Purposely, Dancing Diva, Let's move it

1. Koda Kumi - [99% of her songs]
2. Ayumi Hamasaki - [Most ballads/rock songs]
3. Namie Amuro - [Want mex2 / Put 'Em Up / Full Moon / New Look / Rock Steady]
4. Kanon Wakeshima - [still doll / Suna no oshiro / Monochrome frame / Ennui Kibun!]
5. Teriyaki Boyz - [Tokyo Drift / HEARTBREAKER / Chou LARGE / Celebrity Death Match]
6. AZU - [Jikan yo Tomare / Saigo no Koi]
7. Mai Fukui - [Ai no Uta / My Song for You]
8. Nana Tanimura - [JUNGLE DANCE / Sexy Senorita]
9. Utada Hikaru - [SAKURA Drops / Can you keep a secret?]
10. ayaka - [Okaeri]

Here is mine:

ayumi hamasaki--Mirrorcle World / talkin' 2 myself / Rule]
Tohoshinki--[Kiss The Baby Sky / Begin / Bolero]
Koda Kumi--[BUT / TABOO / show girl]
Namie Amuro--[TOP SECRET / Do Me More / WILD]
Yuna Ito--[Precious / Mahaloha / Power of Love]
Spontania--[今でもずっと feat.伊藤由奈 / 君のすべてに feat. JUJU / My Life]
Mika Nakashima--[LIFE / SAKURA ～花霞～ (DAISHI DANCE) / ORION]
alan--[群青の谷 / 明日への讃歌 / RED CLIFF ～心・戦～]
Aoyama Thelma--[My dear friend / Last Letter / 守りたいもの]

01. Koda Kumi - 甘い罠 / 月と太陽
02. DBSK - どうして君を好きになってしまったんだろう？ / "O"-正.反.合.
03. Big Bang - 마지막 인사 / 반짝반짝
04. SHINee - 아.미.고 (Amigo) / 너 아니면 안되는 걸 (ROMANTIC)
05. Lee Hyori - U-Go-Girl - with 낯선 / 깊이
06. Emi Hinouchi - O'kay / GOODIE MEMORIES
07. Miliyah Kato - Last Summer / So gooood
08. Ayumi Hamasaki - Mirrorcle World / Duty
09. Lee Minwoo - The "M" Style / 용서해
10. Nao'ymt - Next Morn' / Hot Voodoo

As of now:

1. Ayumi Hamasaki [all songs]
2. TUBE [LOVE SONG, Kimito nara, Jyunen saki no love story]
3. X Japan [Forever Love, Say anything]
4. Fukuyama Masaharu [Tokyo, Niji]
5. Ryuichi Kawamura/LUNA SEA [Love is..., I for you]
6. Koda kumi [Yume no uta,]
7. CHEMISTRY [My gift to you, ashita e kaeru]
8. Hirai Ken [Miracles, Strawberry Sex, Life is... ~another story~, hitomi wo tojite]

both 1. Ayumi Hamasaki (endless sorrow, mirrorcle world)/ Hikaru Utada (keep tryin', beutiful world)
3. Namie Amuro (do me more, wo wa)
4. Jolin Tsai (dancing diva, agent j)
5. Ayaka Hirahara (jupiter, hello again jojo)
6. L'arc~en~ciel (stay away, honey)
7. Rina Aiuchi (deep freeze, orange night)
8. Hitomi Shimatani (~mermaid~, angelus)
9. Brilliant Green (crazy girlfriend, rainy day)
10. Do as Infinity (desire, tangerine dream)

I will limit my current favorites to 3...ogm :weep
01. Maki Goto - Daite yo! PLEASE GO ON, LIKE A GAME, Ima ni Kitto...In My LIFE
02. SWEET BLACK feat. MAKI GOTO (hah..)- Fly away, Lady rise
03. Ami Suzuki - all night long, white key (or maybe OUR DAYS), FREE FREE
04. Namie Amuro - Chase the Chance, Don't Wanna Cry, GO! GO! ~Yume no Hayasade~
05. Ayumi Hamasaki - A (four songs...but w/e), Dearest, SURREAL
06. Tomomi Kahala - Just a real love night, I'm Proud, PRECIOUS
07. SMAP - SHAKE, $10, Love Loser
08. globe - Love again, FACE, SWEET PAIN
09. KAT-TUN - Keep the faith, NEVER AGAIN, Yorokobi no Uta
10. ULFULS - Gattsu Da Ze!!, Naketekuru, Banzai "Suki De Yokatta"
11. Koda Kumi - BUT, Butterfly, Star
12. Petitmoni - BABY! koi ni KNOCK OUT!, Chokotto LOVE, WOW WOW WOW
13. Morning Musume - Furusato, Koi no dance site, Renai Revolution 21
14. W - Miss Love Tantei, SEXY SNOW, Jinx
15. Mini Moni- Mini Moni Jankenpyon!, Minihamuzu no Ai no Uta, Mirakururun Grand Purin!
16. hitomi - Japanese girl, by myself, SAMURAI DRIVE
17. Coconuts Musume - Jouentsu Yuki Mirasen, Zurai Onna (english version), Halation Summer
18. Tanpopo -Koi wo Shichaimashita!, Ōjisama to Yuki no Yoru, Otome Pasta ni Kandō
19. Anna Tsuchiya - Crazy World, SLAP THAT NAUGHTY BODY, Somebody help me
20. Leah Dizon - Love Paradox, Koi Shiyou, Communication!!!
21. Akina Nakamori - DESIRE, TATTOO, Aibu
22. Kanjani 8 - Sukiyanen, Osaka., Zukkoke Otokomichi, Misetekure
23. Arashi - Happiness, Step and go, Kitto Daijoubu
24. Utada Hikaru - COLORS, Automatic, First Love
25. V6 - MADE IN JAPAN, TAKE ME HIGHER, MUSIC FOR THE PEOPLE
26. Bonnie Pink - Private Laughter, Heavens Kitchen, A Perfect Sky

Forgot a few but I feel like stopping. Everyone after Ayu was whoever came to mind first :>

01. Ayumi Hamasaki - Dearest
02. Utada Hikaru - FINAL DISTANCE
03. Mr. Children - Innocent World
04. Namie Amuro - Full Moon
05. Mai Kuraki - always
06. B'z - Alone
07. Koda Kumi - Shake it Up
08. Jolin Tsai - Dancing Diva
09. alan - Sora Uta
10. BoA - Dakishimeru
11. Southern All Stars - Namida no Kiss
12. Nightmare - The World
13. L'arc-en-Ciel - Niji
14. YUI - Rolling Star
15. Ai Otsuka - Planetarium
16. Ken Hirai - Pop Star
17. Yuna Ito - Endless Story
18. Morning Musume - Happy Summer Wedding
19. Jay Chou - Coral Sea
20. ayaka - I Believe

18/20 japanese

01. Utada Hikaru [Keep Tryin' / Wait & See ～リスク～ / This Is Love]
02. Namie Amuro [Hide & Seek / Top Secret / GIRL TALK]
03. Ayumi Hamasaki [Bold & Delicious / Days / Voyage]
04. Koda Kumi [BUT / TABOO / This is not a love song]
05. HINOI team [IKE IKE / NOW AND FOREVER / NIGHT OF FIRE]

1. Ayumi Hamasaki - [Sparkle, Mirrorcle World, STEP you]
2. Koda Kumi - [TABOO, BUT, show girl]
3. Tohoshinki - [Survivor, 呪文 -MIROTIC-, SHINE]
4. Namie Amuro - [WHAT A FEELING, WILD, ROCK STEADY]
5. Utada Hikaru - [Passion, Keep Tryin', Beautiful World]