Tax_Query and Orderby

Hi there

Apologies but can’t for the life of me get the ‘orderby’ and ‘order’ to work. Can anyone point me in the right direction as to what I’m doing wrong please?

$args = array(
     'orderby' => 'title',
     'order' => 'DESC',
     'tax_query' => array(
	  array(
	  'taxonomy' => 'therapies',
)));

$query = new WP_Query( $args );