I can't download certain apps on my iPhone?

I accidentally deleted one of my music apps from the app store, and I paid 2 dollars for the app, when i searched for it in the app store instead of it saying FREE, it says Open, I click open, it asks for my apple password, and nothing happens. This happens when I try to update some apps too. The only thing I can think of is to download it through iTunes, I tried, but it says I have to pay money for it again, and I'll lose all my music from the music app that I had on it. I tried resetting, I even searched google for answers, but nothing helps.

That is crazy

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