i think Koki knows piano. i don't think it's up to Ueda standards, lol, but i think he can play it well. (...i remember he played it in an episode of cartoon KAT-TUN) i'm not sure with Taguchi & Nakamaru.
here's a fan translation of the Kame solo (I REFUSE TO CALL IT "I'M A MAN" UNTIL CONFIRMATION.
) :
http://gummy-bear05.livejournal.com/60351.html
it's so sweet.
