This must rank as the most heartbreaking example of premature chicken-counting in musical history. ‘Gotter has made a marvellous free adaptation of Shakespeare’s The Tempest,’ wrote poet Gottfried Bürger to the translator A.W. Schlegel on 31 October 1791. ‘Mozart is composing the piece.’ Three days later, brimming with misplaced confidence, the dramatist Friedrich Wilhelm Gotter confirmed that ‘the edifice is all ready to receive Mozart’s heavenly choruses’.