How to transfer the music from a youtube video to my iphone 4?

Can i please have a detailed step by step on how to download the music from a youtube video, to my iphone 4. I know that is has to be done through the computer. I have a windows 7 computer. I have never done anything like this so i'm a beginner at it.

Download an app called "Playtube - Youtube edition"

You have to download and convert the youtube video to mp3 audio in advanced, then you can drag and drop the mp3 songs into iTunes library and sync it to your iPhone. If you don't know how to do that, this youtube downloader would help you a lot, it's easy to use and works pretty well for me.

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