sentences:  For two years, she worked in the class of Vera Rózsa at the Guildhall School of Music in London, where she obtained an advanced degree in vocal performance.She also takes masterclasses with Jean-Paul Fouchécourt, Monique Zanetti and Helmut Deutsch.Scheen has sung the roles of Lucy in "The Telephone, or L'Amour à trois" by Gian Carlo Menotti, Thérèse in the "Les mamelles de Tirésias" by Francis Poulenc, the First Lady and Papagena in Wolfgang Amadeus Mozart's "Die Zauberflöte", Frasquita in Carmen, Vespetta in "Pimpinone" by Georg Philipp Telemann, Grilletta in "Lo Speziale" by Joseph Haydn, and Zerlina in Mozart's "Don Giovanni".