FIRST OF ALL! THESE SONGS ARE THE BEST PUT ALL TOGHTER FIRST OF ALL:

http://youtu.be/Itd68LBt3l8

CL x Mino x GD x Taeyang - MTBD (멘붕) x I'm Him (걔 세) x Good Boy (Mashup by J2J)

NEXT: 

http://youtu.be/cOoRh5BwV-Y

2NE1, EXO and TOP Mashup   - Come Back Home + Overdose + Doom Dada

ONE OF THE LAST:

http://youtu.be/AU_p_8pXiF4

BIGBANG & PSY & 2NE1 - I AM FANTASTIC GANGNAM STYLE BABY

i will try to find more to post~!