 If you liked
Kaikan♥Phrase
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 ...then you might like
Ai wo Utau yori Ore ni Oborero!
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I'm surprised no one has already recommended these 2 together. Both are by Mayu Shinjo (so smutty) and both deal with musicians, although Kaikan Phrase isn't focused on crossdressing. Kaikan Phrase also is more about celebrities where as Ai Ore is more about school students, but I think if you like one, you'll like the other.