How to add free music to you iPhone?

I just got my iPhone and don't know how to download music I need some free songs because if I buy all them songs I will go bankrupt I love music so please help and thanks

So i use a program called Copytrans Manager.

Find the songs on youtube, and convert them to mp3 files. There are a bunch of websites that'll do that for you. Just Google youtube to mp3 converter. All the free music you want! I'd recommend this one (sometimes the conversion doesn't work at first, just try again until it does, it's worth it, really high quality mp3 files).

http://utubeconverter.com/