How to download free music on to my iphone 4s?

I just got an iphone 4s and am keen to put music on it, i don't have alot of money at the moment because i'm only 13 and can't link it to my card so could you tell me how to download FREE music for it? The only problem is that i want the songs to be in my music file, please help!

Heres a good site.
http://www.downloads.nl/local/en/mp3.html

Look up a song and click on it to listen to it, then right click on 'download' and save it wherever you want.

That would be illegal. If you can't afford to spend less than $1 on a song, how do you expect to pay off the potential fines of up to $150, 000.00 per song?

Amazon has some free tracks. And you can rip your CDs.

Just take any mp3 and select and add it to your itunes list, then copy to the iphone.