Raven, use this one mate http://www.youtube-mp3.org/ The first one I gave ya, is tripe, as theres loads of ads, and it seems to have limits on it. And takes ages. Although the android app version of it is amazing. Link in this post is super quick, and really easy to use.
If you feel guilty, then ever Blind person in the world should too. (terrible comparison I know) I'll be lashing off this later this evening IF I get any spare time.