IPhone app that lets you download music?

So I had this app, it was brilliant. It let me download music from YouTube so that I could listen to as many songs as I wanted offline. However I updated my phone and it deleted it. I know these apps are illegal or whatever but I can't afford Spotify. I have searched the App Store and web to find an app that can do what my old one could but I just can't. Can someone help?

No

Can't help you with your illegal activities.

Why do you think that Apple removed those apps years ago?

Spotify is pretty cheap… Its worth it

You won't like this answer and will probably give me a down thumb or even report it for no good reason…

You answered your own question, "I know these apps are illegal".

I can't afford a Cadillac, but that does not give me the right to take it from a parking space somewhere because I want one and "found" it.