Vocal Ensemble | Cathedral Choir | Choralschola | Cathedral Orchestra | Serving as Cantor The St. Stephen’s Vocal Ensemble is at the heart of the various musical activities at St. Stephen’s Cathedral. The ensemble size ranges from 24 to 36 professional singers, depending on the composition. The repertoire ranges from works of Renaissance vocal polyphony, Viennese Classicism and Romanticism to contemporary liturgical compositions.