docs: def download(self, directory='~/Music', song_name='%a - %s - %A'):
          """
          Download a song to a directory.
  
          :param directory: A system file path.
          :param song_name: A name that will be formatted with :meth:`format`.
          :return: The formatted song name.
          """
          formatted = self.format(song_name)
          path = os.path.expanduser(directory) + os.path.sep + formatted + '.mp3'
          try:
              raw = self.safe_download()
              with open(path, 'wb') as f:
                  f.write(raw)
          except:
              raise
          return formatted