Prior to his arrest, he had officially divorced his wife Soňa in order that she and their young daughter, Olga, would not suffer a similar fate.

In the film, Theresienstadt, children are seen singing Hans Krása's opera, Brundibár, and Haas can be seen taking a bow after a performance, conducted by Karel Ančerl, of his Study for Strings.

When the propaganda project was over, the Nazis transferred 18,000 prisoners, including Haas and the children who had sung in Brundibár, to Auschwitz-Birkenau, where they were murdered in the gas chambers.

Doctor Mengele was about to send Ančerl to the gas chamber first, but the weakened Haas began to cough, so the death sentence was chosen for him instead.

[6] Haas's large-scale symphony, which he began prior to his deportation to Theresienstadt, remained unfinished, but the extant material was orchestrated by Zdeněk Zouhar in 1994.

[citation needed] Principal publishers: Boosey & Hawkes, Bote & Bock, Sádlo, Tempo The whole music written in Concentration Camps (including P. Haas's Study for Orchestra, 4 Chinese Songs and Al s'fod) are contained in the CD-Encyclopedia KZ MUSIK created by Francesco Lotoro (Musikstrasse Roma- Membran Hamburg), 2007 Haas is a central character in David Herter's First Republic trilogy, comprising the novels On the Overgrown Path, The Luminous Depths and One Who Disappeared.