K-On yuri, or anything close to it. Because something is bound to happen with an all-girl band. Especially when they all have lesbians tendencies and a teacher with a cosplay fetish. What's not to love?
A lot of the pictures I come across don't have sources unfortunately, so if you ever see an image and know where it's from, please let me know so I can add that to the post! (✿◠‿◠)