What's the best music downloader app to get on iphone?

Ok so I have a iphone 4 and some of the apps I've been looking at are confusing they are high rating but when I download them all it is is something with a browser like I don't know want website to type in to download free music I want one where it already has some stuff where I can just type in a song or artist and that's it nothing complicated if you understand where I'm coming from please help thanks

Hi
I use these apps
-Free Music Download - Mp3 Downloader By ASPS Apps
-MP3 Music Downloader Free
-MyMedia - Download Manager
By Alexander Sludnikov
-Downloads - Downloader & Download Manager
By Hian Zin Jong
-Download Manager Lite
By VTechnology
All these apps are amazing and I rely on these apps so give them a try.