Ivan Hewett interviews Viennese composer Kurt Schwertsik, a man who studied under Kagel and Stockhausen but turned his back on the astringent modernism of Darmstadt to follow his own musical path, with a belief in the inherent validity of tonality and a firm desire to discover new musical textures. Kurt Schwertsik: ...in keltischer Manier... Concerto for Alphorn and Small Orchestra op. 27 (12:40) Nury Guarnaschelli (alphorn) Deutsche Radiophilharmonie Michael Sanderling (conductor) Kurt Schwertsik: Irdische Klange cycle Irdische Klange Symphony op.37 (17:00) Uluru op.64 (17:36) Funf Naturstucke op.45 (15:36) Mit den Riesenstiefeln op.60 (5:21) BBC Philharmonic H.K. Gruber (conductor).