Maria Stuarda is one third of the so-called "three queen" trilogy that defined much of the career of Beverly Sills (along with Lucia, the three Hoffmann heroines, and Manon) in the early 1970s. It was quite an undertaking, and each–Stuarda, Anna Bolena, and Roberto Devereux–was recorded by the since-disapppeared ABC Audio Treasury Series. For reasons opera lovers have been wondering about for years, the recordings went out of print pretty quickly; but now, handsomely remastered, they are making their first appearance on CD, both individually and as a three-opera set. Stuarda also has been recorded by Joan Sutherland and Janet Baker (in a version Donizetti prepared for the lower-voiced Maria Malibran), and there are at least three "private" sets I know of with Montserrat Caballé in the title role.
If you want to know the reason behind all the fuss about Maria Callas, buy this CD. Callas's great gift was not purity of tone or emission, reliability, or sheer loveliness; it was, rather, her ability to change her vocal color and style to suit not only particular periods of opera but to get under the skin of the individual characters she portrayed.
A rendition of a tango operita, commissioned by the Argentinian Ministry of Culture (this rendition anyway), was revived by violinist Gidon Kremer, who had such a love for the original LPs from Piazzolla and Horacio Ferrer that he wanted to recreate the music. Ferrer was kept on as El Duende (the Goblin) – the role that he created when he wrote the libretto thirty years earlier. Regrettably, Piazzolla had passed on prior to the remake. Nonetheless, the arrangements and orchestrations are remarkable. The suffering and the passion of Maria (the main character in the show) are perfectly portrayed by the tango. The music changes forms as her character progresses, taking on traditional tangos, modern tangos, milongas, waltzes, and other styles to reflect changes in Maria. The music is always well-composed. This is an opera for the display of modern music, and the tango of Piazzolla is modern music at its finest.