code: def songs_add(self, songs):
  		
  
  		mutations = [mc_calls.TrackBatch.add(song) for song in songs]
  		response = self._call(
  			mc_calls.TrackBatch,
  			mutations
  		)
  
  		success_ids = [
  			res['id']
  			for res in response.body['mutate_response']
  			if res['response_code'] == 'OK'
  		]
  
  		return success_ids
docs: Add store songs to your library.
  
  		Parameters:
  			songs (list): A list of store song dicts.
  
  		Returns:
  			list: Songs' library IDs.