 If you liked
Ryouma! The Prince of Tennis Shinsei Movie: Tennis no Oujisama
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 ...then you might like
Versailles no Bara (Movie)
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Both are film productions, with many musical-like song performances. They are recommended for those who are interested in the idea of an anime work that is like a musical.
The Prince of Tennis is an original story with CGI and more romantic depictions than the TV series. The Rose of Versailles is a compilation of the TV series.