The SWF site, in its current design, was released in June 2017.
Eight years later, it gathers :
– almost 330 news items;
– a detailed list of almost 2,600 concerts;
– 363 photographs;
– a discography;
– 69 concert programmes in facsimile;
– more than 30 in-depth studies;
– 118 circulars;
– 17 (soon to be 18) products for download;
– 75 albums on streaming...
As far as I know, nowhere else is there such a site, not only about Furtwängler, but also about another great classical performer.