Best Mp3 Downloader App For IPhone?

So I Had An Mp3 Downloader App, It Got Deleted, It's Blue With A White Music Note I Think It Was Called "Mp3 Music" I Can't Find It So I'm Asking For Your Help To Find It Or Find A Similar One To It.

I Would Like An Mp3 App With:

*Unlimited Downloads
*Be Able To Edit Song Names And Album Cover
*An Mp3 App That Has A Web Search To Download Music From
*Being Able To Create Playlists
*Being Able To Convert Videos To Mp3 Music

Thanks! I Hope You Guys Help! You'll Be So Awesome If You Do!

Also I Would Like To Be Able To Listen To Somgs Without Wi-Fi And Listen To It With The Lockscreen

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