orologio en Altadefinizione. Live performance, part of Monteverdi cycle staged by Oper Zürich with Nikolaus Harnoncourt conducting the Zürich Opera House Monteverdi Ensemble. Staged and directed by Jean-Pierre Ponnelle. Filmed 28 March – 20 April 1978 in Vienna, sound recorded 1 – 25 December 1977 in Zürich.