DAMN YOU KYOANI! Those guys have done it again!

Yet another hit from the creators of Haruhi and Lucky Star...





And, yes a cover band already for the op! Accessible only to those with Nico Douga accounts though:
【ニコニコ動画】【けいおん！】K-ON! OP 「Cagayake!GIRLS」を弾いてみたよー