 If you liked
Rinne no Lagrange
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 ...then you might like
Macross Δ
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Both are anime about a musical theme, a lot of cute girls, a rival group of pretty boys, mechs, and war against aliens.
Differences: Lagrange has 3 girls and Macross has 5, Lagrange has a female protagonist and Macross has a male protagonist, Macross has pop idols and Lagrange doesn't.