Die Soldaten
Kertész-Gabry received an appointment to the Bremen Opera from where she moved on to Cologne in 1960. On 15 February 1965 she distinguished herself as a dramatic coloratura soprano in the lead role of Marie in the premiere of Bernd Alois Zimmermann's opera, "Die Soldaten". Zimmermann's four-act opera commissioned by the Cologne Opera is considered one of the most important and influential operas written in Germany since the second world war." In 1974 she performed this role once again in Zimmermann's shortened concertante version of his opera, the "".