Wiera Gran had a low alto voice even in early 1934, when at the age of 17 when—using the pseudonym Sylvia Green—she made her first recording, the tango Grzech.

Some of her best known songs include "List", "Wir tańca nas porwał", "Gdy odejdziesz", "Trzy listy", "Fernando", "Cicha jest noc", "Varsovie de mon enfance", "Ma Patrie" and "Mazowiecki wiatr".

[4] In 1947, the Citizen's Court of the Central Committee of Polish Jews (Sąd Obywatelski przy Centralnym Komitecie Żydów Polskich) heard the case and Gran was found not guilty in 1949.

[3] Wiera Gran later tried to emigrate to Israel where she had to face similar accusations[5][6] by Jonas Turkow, Adolf Berman, and Pesach Burstein and was boycotted.

[3] In her book Sztafeta Oszczerców[8] published in 1980 in Paris, Gran gives her own account of events and argues her innocence accusing Jonas Turkow of collaboration with the Gestapo.