Using iTunes. How to do I make mp3 files out of mp4 files - using cds?

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I should have said m4a files instead of aac files. I copied some audio guru’s explanation, and pasting it.

  1. AAC stands for either MPEG2 Advanced Audio Coding or MPEG4 Advanced Audio Coding.
    The MPEG2 audio-encoding standard of the format is not backward-compatible with MPEG1 audio. MPEG2 AAC can produce better audio quality than MP3 using less physical space for the files. MPEG4 AAC can produce better quality and smaller files than MPEG2 AAC. AAC is the audio file format used by Apple in their popular iTunes Music Store

  2. The audio file format used by Apple in their popular iTunes Music Store often appears on your system with the “.M4A” filename extension. M4A can produce better audio quality than MP3 using less physical space for the files

  3. M4P format is “protected AAC”. It is a format of purchased music that can be listened to only through the iTunes softer or an iPod.