Janet Cardiff, in her exhibition The Forty-Part Motet, understands intuitively a cardinal aesthetic principle – that less is more. With a show the only material features of which are loudspeakers, positioned in a circle as they convey a pivotal Elizabethan musical work, Cardiff notes the virtues of a spartan layout that emphasises the nuances of the score over what might otherwise seem invasive ephemera. Taking as the title of her presentation the technical make-up of Thomas Tallis’ exquisite Spem in Alium (Hope in any Other), Cardiff reworks a piece for eight choirs of five voices each. In doing so, she is careful to distinguish her accomplishment, as one who purely experiments with music, from one she well knows to lie compositionally with a celebrated late Tudor prodigy. He creates, she adapts, and Cardiff admirably resists the temptation to impose embellishments that would vainly seek joint attribution. Spem in Alium Nunquam Habui (1573) was supposedly written to mark Elizabeth I’s 40th birthday, and Cardiff’s strikingly original perspective is as meditative as it is engaging.