Moshe Wilensky was born in 1910 in Warsaw, Poland. During the first World War, his family emigrated to Russia where they stayed until 1917, when they returned to Warsaw. In his youth, he studied at the "Eskela" Jewish Gymnasium, where the Hebrew was taught in addition to general studies.
Isaac Schlossberg is a composer and conductor. He was born in 1877 in St. Petersburg to a family of hereditary cantors. His grandfather, Nathan Schlossberg, and his father, Arie-Leib Schlossberg (also known as Leibke Aluxter) were cantors.