2NE1× ピストルバルブ(Pistol Valve) collaborated. Pistol Valve is a Japanese girls brass instrument rock band. ^_^I am glad to see the girls collaborating with another Japanese girl group! Girl power for the win! More more collabs in the future!
More screencaps in the gallery after the cut:
Credits: @thedearestdara @mirepon21 @2me2day1 @tonyaaa1217ton
oh-dara.com 
Comments on: "Screencaps: 120222 2NE1 Performs a Brass Instrument Version of “I Am The Best” for Japan’s The Best House 123" (2)
dara,,gorgeous!!!
Wish i was there!!!2NE1 HWAITING<33