 The ensemble may be regarded as the cradle of what has been called the 'Third Viennese School', of which Gruber is now the best-known representative.Like Schwertsik, Gruber had been taught in the post-Schoenbergian style of the Second Viennese School, but – also like Schwertsik – rapidly came to his own personal accommodation to tonality and older Viennese traditions.The critic Paul Driver has written of Gruber