Gideon Klein's arrangements of folksongs, for the prisoner choirs in the Terezin ghetto.

These were the first compositions that Gideon Klein composed whilst imprisoned in Terezín, dated 1942, and reflecting the ban, eventually lifted, on using instruments. This prohibition was turned into a virtue, resulting in a preponderance of unaccompanied amateur choral music. There are six extant settings, including Poljuško, pole the well-known 1933 Red Army Song of the Plains, as it is often translated as, originally composed by Lev Knipper, with lyrics by Viktor Gusev.