Ok, here are a few simple steps.
1. First, go to youtube.
2. Search for whatever songs you want.
3. Copy the link of the video. Example : http://www.youtube.com/watch?v=FsGF98zQsaI
4. Go to Youtube Catcher : Video to mp3.
5. Paste the link of the music video into the box.
6. Click download. Don't download using Torrent Downloaders.
7. When you've finish downloading, rename the file to the song you wanted. Because it would be named ''Ripped from Youtube Catcher'' or something like that when you download it.
8. On the song using your programme, and tada!