What's a good free music app for iPhone?

Please tell me

Looking for free music? Amazon has over 45,000 free songs
http://www.amazon.com/...zon.com/s/

Spotify is a good program. If you are a first time user you get a 30 day free premium service. After that thirty days you can still play music just with advertisements every now and then.
I personally find Spotify the easiest to use and the best music program compared to others.

Youtube its FREE

Personally I had no issues just listening to music from YouTube when I had my iDevice. You should definitely check out the radio stations that are available through iTunes though. When you click the iTunes app on your iPhone, you can choose to listen to radio stations and most if not all are free. They have ones that are dedicated to strictly country, Disney show tunes, orchestra… You name it, they've probably made a radio station out of it. It's very convenient if you're throwing a party and just like to have background music too.

Itube