If you think rags to riches stories as impossibly fanciful think again. Anna Netrebko is often said to be successor to the ultimate diva, Maria Callas. The legendary opera icon was undoubtedly unique. Was this because Maria Callas had also enormous personal charisma? Or was it that whilst her rivals sang their dramas the American born star lived them. In Tosca, Maria Callas forgot her identity and she herself morphed into becoming the tragic Tosca.