Why is my iPhone 5 C not letting me download music from Youtube?

Note: I really do not want to hear: That's illegal or why don't you just go buy your music. I know its not exactly legal. Anyway. On my old iPod Touch I was always able to download music off of Youtube. I would use the listentoyoutube.com. I tried to get my download to my iPhone library and it said something about it not being correct or something. I don't know. But if anyone would be able to help me it would be greatly appreciated.

Use www.youtube-mp3.org or an app called iTube

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