The New York Times talks 1939 in their ‘Classical Playlist’! Here’s the paragraph:

“The shadow of war and persecution hangs heavily over this deeply poignant recording of music written around 1939. The violist Teng Li brings a ripe, burnished sound and elegant command of phrasing to a fascinating program. Hindemith‬’s intense Sonata for Viola and Piano is the only known quantity here, framed by a Concertino by the Belgian composer Joseph ‪#‎Jongen‬; wistful arrangements of love songs by Viktor ‪Ullmann‬, who perished in Auschwitz; and a pensive arrangement of “The Moon Reflected in Er-Quan” by the Chinese erhu master Hua ‪Yanjun‬, known as Abing. A defiantly forward-looking Duo for Violin and Viola by Gideon ‪Klein‬, another victim of the Holocaust, rounds out this thought-provoking disc.” (Corinna da Fonseca-Wollheim), full write-up here.