My songs won’t appear on my music app even though iTunes says it’s purchased

So I bought the rest of a Pokémon Black and White Album that I wanted on iTunes with a gift card, and they all say purchased, but when I go in my music app, and my settings app and go into the music app, it says I only have 2 songs on it, the ones a bought before the rest of the album. I don't know what happened, so I need help.

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