K-ON is surprisingly short and sweet.

K-ON! 1-13! is an anime about four high school girls in a light music club (which is just a band...not sure what the 'light' refers to.) In the first episode we learn that the club needs 4 members to survive. Yui (soon to be guitarist) is an abnormally klutzy girl who wants to do something new in high school. She spent most of her life being a bum (darn cute flashbacks) and thus, she joins the music club without knowing how to play any instrument. The other three members are Ritsu (the outgoing drummer), Mio (the shy bassist) and Tsumugi (the kind keyboardist).
( In the mood for high school fluff??? )