 If you liked
K-On!
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 ...then you might like
Love Live! Sunshine!!
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Both animes are about schoolgirls, who are doing music in a school club. K-On is definitively more rocking than the normal Love Live stuff. But Love Live! Sunshine!! has the concurrent idol group Saint Snow, who definitively knows how to rock. Therefore if you like K-On for the rock music or you think, Saint Snow is the better school idol group, than you schould watch the respective other show!