This extraordinary recording from 1928 has finally popped up on Youtube. Here's the second movement of Brahms's Piano Trio in C, Op.87 played by Jelly d'Aranyi (violin), Myra Hess (piano) and Gaspar Cassado (cello).
As I understand it, these sessions - this Brahms and also the Schubert B flat Trio (with Felix Salmond on the cello) - were Hess's first recording. She and Jelly d'Aranyi worked together for some 20 years, giving countless recitals at the likes of the Wigmore and Queen's Hall, but these trios seem to be the only surviving example of their collaboration.
Sometime in the war years, it appears that they must have had a massive fallout. Serious enough that in Hess's biography by Marian McKenna, d'Aranyi - her duo partner for two decades - is afforded just one mention, in passing. I've met a number of people who knew one or the other, sometimes both, yet nobody seems sure exactly what went wrong.
The music world is full of these situations, of course, and in the end it's immaterial since the result, unfortunately, was the same whatever the cause. But when you hear the fine blend of their sounds, d'Aranyi's mellifluous charm sparking against Hess's wit and intelligence, the flow of detail and infinite shading of ideas that takes place in their music-making (it's even more obvious in the Schubert, incidentally), it seems little short of tragic that their every move was not captured by microphone - and that their partnership has somehow been wiped from history.