Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Maria Sings Mozart

Maria Callas herself admitted that Mozart opera was the hardest for her to sing. She never sang a Mozart opera on stage. She sang these arias in concerts and recitals. On this album we are treated to her take on Mozart. With her huge, dramatic voice, she was fully capable of singing Dona Ana in Don Giovanni, but for some reason she never sang the role on stage. Mozart was not her specialty and it was not something she was trained to sing. In those days, German singers specialized in Mozart, not Italian singers like Callas. But she sings the heck out of "Ah Perfido" by Beethoven, "Or Sai Che L'Onore" Dona Ana's aria from Don Giovanni as well as the more subdued "Non Mi Dir". No one can imagine Callas as the Countess in Figaro but her "Porgi Amor" is really quite haunting and moving. If you're curious to hear Callas singing Mozart, check this out.