What school is a group of composers, interpreted by the soprano Alessandra Marc and was initially characterized by expanded tonality and Schoenberg's own evolution? 
Alessandra Marc: Alessandra Marc (born July 29, 1957) is an American dramatic soprano who has appeared at many of the world's opera houses and orchestras. Alessandra Marc:  Marc is particularly known for her interpretations of the works of Richard Strauss, Richard Wagner, Giuseppe Verdi, music of the Second Viennese School, and the title role in Puccini's "Turandot". Second Viennese School:  Their music was initially characterized by late-Romantic expanded tonality and later, following Schoenberg's own evolution, a totally chromatic expressionism without firm tonal centre, often referred to as atonality; and later still, Schoenberg's serial twelve-tone technique.
i don't know