Where can I find an app that i can download music?

Okay I've been searching for a lot of download music apps but I don't which one to buy, because I don't want to waste my money. Please if you have one that download all sorts of music, lets you browser the web and download music from websites in the internet please tell me. I used to have one it was called MP3 Music but they changed and now I can only download mixes from sound cloud it doesn't even let browser the web.

(I have an Iphone 5c with the lastest iOS7. ) willing to pay if the app cost money.

Research: Spotify - where you can download music to practically ANY device!

Their Premium Service costs $10 a month.