Hers is generally regarded as one of the greatest voices ever produced in Australia .
Deborah Riedel ( 31 July 1958 -- 8 January 2009 ) was an Australian operatic soprano .
Hers is generally regarded as one of the greatest voices ever produced in Australian .
Deborah Riedel ( 31 July 1958 -- 8 January 2009 ) was an Australian operatic soprano .