 If you liked
Kaikan Phrase
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 ...then you might like
Kiniro no Corda: Primo Passo
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If you liked the musical bishie aspects of Kaikan Phrase (rock band trying to make it big), you might like La Cordo D'Oro (a reverse harem at a high school for music). Story-wise, they're not so similar, but the ingredients are kind of the same. The biggest difference would probably be the fact that one's rock and the other is more classical. ^v^