MP3 files are "industry" standard for music, some audio books, etc. MP4's are Apple's iTune proprietary audio format, and they are encrypted where you cannot play them on non iPod MP3 players.
There are ways. Check the web if you want to know how. As far as we know, it is legal to convert an mp4 to an mp3 file; however, we won't post how here just in case.
Beyond the Encyclopedia
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Have you ever wondered where on earth your local librarian found the answer
to that extremely specific question you asked? You may assume that they are
jus...
4 days ago