code: def tag_audio(filename, tracklisting):
      
      # TODO: maybe actually glob for files, then try tagging if present?
      if not(tag_audio_file(filename + '.m4a', tracklisting) or
             tag_audio_file(filename + '.mp3', tracklisting)):
          print("Cannot find or access any relevant M4A or MP3 audio file.")
          print("Trying to save a text file instead.")
          write_text(filename, tracklisting)
          return False
      return True
docs: Return True if audio tagged successfully; handle tagging audio.