docs: def _gather_field_values(
  	item, *, fields=None, field_map=FIELD_MAP,
  	normalize_values=False, normalize_func=normalize_value):
  	"""Create a tuple of normalized metadata field values.
  
  	Parameter:
  		item (~collections.abc.Mapping, str, os.PathLike): Item dict or filepath.
  		fields (list): A list of fields used to compare item dicts.
  		field_map (~collections.abc.Mapping): A mapping field name aliases.
  			Default: :data:`~google_music_utils.constants.FIELD_MAP`
  		normalize_values (bool): Normalize metadata values to remove common differences between sources.
  			Default: ``False``
  		normalize_func (function): Function to apply to metadata values if
  			``normalize_values`` is ``True``.
  			Default: :func:`~google_music_utils.utils.normalize_value`
  
  	Returns:
  		tuple: Values from the given metadata fields.
  	"""
  
  	it = get_item_tags(item)
  
  	if fields is None:
  		fields = list(it.keys())
  
  	normalize = normalize_func if normalize_values else lambda x: str(x)
  
  	field_values = []
  
  	for field in fields:
  		field_values.append(
  			normalize(
  				list_to_single_value(
  					get_field(it, field, field_map=field_map)
  				)
  			)
  		)
  
  	return tuple(field_values)