Question: 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? 
Sentence (from "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.
Relevant evidence: Yes