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Big Bang with Last Farewell
2NE1 and 4minute after them.
DBSK's why did i fall in love with you<3
then
G-Dragon's Crayon!
My sister kept on listening to those song and so I started liking 'em too
Well, Big Bang at first but then I started listening to EXO and got madly addicted, that I even bought 12 huge EXO posters from comic con and stuck them on my bedrooms wall lool xD.
First it was Seungri's Strong Baby and through him, I met the amazing Bigbang and I am still struck to this day.
EXO - Growl and MAMA
Wonder Girls :x 
2AM - Never Let You Go
EXO----- their 1st album such as OVERDOSE,HISTORY,GROWL,etc :)
DB5K, with SuJu and BB in a close race for second.
I was an avid fan of TVXQ for so many years, it all started with Rising Sun
Big Bang - Haru Haru
FIRST = 2AM - You Wouldn't Answer My Calls
Then = 2PM - Hands Up
Miss A - Goodbye Baby
WG - Be My Baby
SNSD - Gee
For me it was f(x) :)