In 1946, she settled in Italy, where she appeared in concert often with pianist Luigi Cortese [it], later becoming a regular guest at the Rome Opera and La Scala in Milan. She created the role of the mother in Dallapiccola's Il prigioniero on Italian radio in 1949,[2] and also sang the role in the first staged performance in Florence, the following year, on 20 May 1950.[1] A fine-singing actress and musician, she sang several roles in Italian contemporary works by Malipiero, Ghedini, and Lualdi.
László also recorded a number of the Bach cantatas conducted by Hermann Scherchen.[2] She was the soprano soloist on Hermann Scherchen's recording of Beethoven's Ninth Symphony (Westminster HI-FI, WAL 208, 1953).