After watching K-ON!! episode 24. It made me want to remember all the previous episode of K-ON then I found this AMV that called "Let's go." they said "The song is a official quintet version from the talk show CD Radi-On!(rajion) Special! Vol.1".I do not know if this a official song or not but it leave quite a impression in my mind that this AMV is good for remembering K-ON! past event. Anyway you decide if is good or not, but for me Its great hehe.