Informazzjoni minn organizzazzjoni tal-arti (Verifikat minn Operabase)
Letonja, Quasthoff, H. Müller, H. Schiff / Webern, G. Mahler, R. Strauss by Webern, Mahler, Strauss, Minn (2001/2001), Surmast Direttur Marko Letonja, Wiener Konzerthaus, Vienna, Austria