I'm buying music thought the iTunes store with my iPhone?

Okay so i'm buying music thought the iTunes store with my iPhone.
but every time i purchase a song it says downloading then when its done downloading it says processing and then goes back to downloading again. And the process starts all over again. I don't know why its doing this. I have enough GB's left on my iPhone.

Added (1). I click stop and download again and it does the same thing

Click stop downloading then try again.

Perhaps you should try posting this question using a header that actually says what you're asking - that way people who are more likely to know the answer will know that you asked the question. You've posted basically the same question and people who don;t click on questions they're sure they'll answer will easily ignore yours.

Try using "music purchased from iTunes store app on iPhone won't download - keeps saying 'processing'"