What's a good MP3 music downloader on iPhone?

Okay so before I upgraded, on my iPhone 4, I had Pockettube pro. I loved it because I could find anything, obviously. I upgraded to the iPhone 6, and downloaded it again and it's completely different. And every app I find, to play the songs you can even download, it uses your data because it's like it plays it from the Internet. I need an app that doesn't have to use data to play a song after it's downloaded.

Just use itunes or stream using pandora or something, it isi illegal to download music you did not pay for so any legal app that sells music or streams music from a paid service will work

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