The nigunim, which are personal, improvised tunes, were passed on by the Jews from generation to generation through the centuries. These soul-searching melodies without words poignantly re-kindled the lives of the Hasidic Jews in Eastern Europe in the early 19th and the 20th centuries. One particular kind was used in prayer and for study, and it can be assumed that Achron heard the Nigun that became 24. Andante Sostenuto – Béla Bartók / György Sándor – Solo Piano Works Hebrew Melody sung by his grandfather at the synagogue and at home. Joseph Achron and his brother, Isidor, were musically trained from an early age by their father on the violin and the piano respectively.