Furtwängler had a unique philosophy of music. He saw symphonic music as creations of nature that could only be realized subjectively into sound. Neville Cardus wrote in the Manchester Guardian in 1954 of Furtwängler's conducting style: "He did not regard the printed notes of the score as a final statement, but rather as so many symbols of an imaginative conception, ever changing and always to be felt and realized subjectively..." This precious edition by Furtwängler was made available following a performance at the Salzburg Festival in 1954, the last year of the director's life and fortunately this was not an amateur tape! The performance was instead recorded by Austrian radio technicians, and still today it can be counted among those that enjoy excellent sound quality.