the aria that Maria callas sings here is "nè sulla terra,vola talor dal carcere...ah conforto è sol la speme..."she didn’t approve the pubblication of the cabaletta; in fact she sings the cabaletta not well,her vocal possiblities in this period were not the same of 10 or 15 years before,but she wanted to sing and she did that well ... maria Callas rhearsing verdi part 7