Music Room from Norfolk House, St James Square, London. The house was designed by Matthew Brettingham and completed by 1756. The plaster cartouches and trophies are attributed to the sculptor-plasterer William Collins. The modillion cornice and Whitehall 'frame' are probably by Thomas Clark, who was master plasterer to the Office of Works from 1761-1782 and who had worked under Brettingham at Holkham