How to get songs off of YouTube onto your iPhone?

Well my friend told me you can like save songs and stuff from YouTube onto you iPhone and they'll like be in your playlist or whatever, but she didn't tell me how to do it, so does anyone know how? I got a new phone and it wouldn't let me use my old account so I lost all of my old music and I have to wait til June To get it fixed. I had over 800 songs and now I don't have any

Ok so find a page that converts youtube videos into mp3 videos then copy the desired songs sunc your iphone with itunes after that click on your iphone's name tab in the left of itunes and there's a tab called edit in the top of itunes click it then click paste wait until it finishes loading unplug you iphone and you got your music there.

To get songs from YouTube on to your iTunes library you find the vid you like and you copy the web address(http//…) and the you go to a web site like this ( http://www.youtube-mp3.org/ ) and you paste the link on there and download it as audio and you'll be able to put it in your iTunes.

There are many other websites you can use if you don't like that one.