Are the free music downloader apps on the App Store for IPhone legal?

I'm just wondering because I have one and it seems to work well, and it's great since it's free, but is it illegal? Seems like it would be, but it's never been taken down from the App Store or anything. So yeah is it legal or not?

No iPhone is only iTunes. Sorry

Yes, they are legal because those apps get free music from legal and free websites. Here is the app I use to download free music: http://www.appfavour.com/music/free-music-downloader-free-download-freelegal-music_452607699/