Mr Denham in your review of Boults recordings of Mahler 5,7 and 8 you state that to your knowledge Bruno Walter never conducted Mahler3.In the biography of Bruno Walter by Erik Ryding & Rebecca Pechefsky on pages 76/77 they state that Bruno Walter conducter two performances of the Third Symphony with the Konzertverein orchestra ,also stating that this was the first time in Vienna that the the symphony was not conducted by the composer.I do not have the ability to confirm the accuracy of the information but most of the book appears to be accurate. Ian Peake