It center around a gruop of Highschool girs that all formed a club called the Light Musik club. The main caracter Yui, joins the light Musik club so that they are able to meet the minimum amount of club members. Yui then learns to play gitarre and becomes part of the band. It's not inapprpiote at all as far as I have seen and makes fr a good comedy/girly drama. Du should probaly watch a few episodes to truly understand what it's about....
these girls are from K-ON, it' s a very funny & cute anime, u can watch it in english on "justdubs.net",on "animefreak.tv", on "dubhappy" and on "watchcartoonsonline.com"