text: Heinrich Sutermeister ( born Feuerthalen , 12 August 1910 â `` died Vaux-sur-Morges , 18 March 1995 ) was a Swiss opera composer .
simplified: Heinrich Sutermeister ( born Feuerthalen , 12 August , 1910 -- died Vaux-sur-Morges , 16 March , 1995 ) was a Swiss composer .