Convert YouTube Videos Into MP3s

I do have a few songs that are broken and that I can't get somewhere else and can't buy however they are on YouTube.I know, quality is not the best on YouTube but for some stuff you have it might be better. Question is, how could I put those flash videos onto my music player?It's actually very simple but the legality of it depends on where you live. Better check out first if you are allowed to convert YouTube videos into mp3s.

How To...