What is a good app to download free music on iPhone 4s?

I'm new to using an iPhone and trying to find a good app for music downloading. So far every app I've looked at wants me to look a song up from a website when I'm use to just getting my songs fast from the apps on tmobile phones

You should try Free Music Downloader - http://www.appfavour.com/music/free-music-downloader-free-download-freelegal-music_452607699/ This free app can help you download music from free sites legally to your iPhone/iPod/iPad and play them using a built-in full functional player which can run in background.

IPhone, iPad Best App! Video Download, Music & Video Player
https://itunes.apple.com/...?mt=8&ls=1

I download all of my music from http://kazagold.com. I LOVE the site, I don't get any viruses on my computer and I can also download my fave movies or tv shows so thats really nice.