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. 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