Leopold Godowsky's version for the left hand alone in his Studies on Chopin's Études is a "rather faithful transformation" "creating the illusion of two-hand writing."[REF]
The Étude, or at least its last section, was orchestrated in 1943 or 1944 in Birkenau by Alma Rosé for a highly peculiar lineup of Women's Orchestra of Auschwitz to be performed in secret for the band's members and trusted inmates, as music by Polish composers was strictly forbidden.