So You've Bought mp3 convert from youtube ... Now What?
https://www.goodreads.com/topic/show/20348905-3-steps-to-help-you-transform-youtube-video-to-mp3-for-ipod-on-mac
It can be done in the simplest and fastest way. Preview it and conserve it as a movie file. So, after downloading the file, you can convert it using the very same software application advertisement that's it!