code: def save_lyrics(self, extension='json', overwrite=False,
                      verbose=True, binary_encoding=False):
          
          extension = extension.lstrip(".")
          assert (extension == 'json') or (extension == 'txt'), "format_ must be JSON or TXT"
  
          for song in self.songs:
              song.save_lyrics(extension=extension, overwrite=overwrite, verbose=verbose, binary_encoding=binary_encoding)
docs: Allows user to save all lyrics within an Artist object