


She received her first piano instruction from her mother, who had been trained in the Berliner-Bach tradition by Johann Kirnberger, who was himself a student of Johann Sebastian Bach. She was not however brought up as Jewish, and never practised Judaism, though it has been suggested that she "retained the cultural values of liberal Judaism". She was descended on both sides from distinguished Jewish families her parents were Abraham Mendelssohn (who was the son of philosopher Moses Mendelssohn and later changed the family surname to Mendelssohn Bartholdy), and Lea, née Salomon, a granddaughter of the entrepreneur Daniel Itzig. Mendelssohn was born in Hamburg, the oldest of four children, including the composer Felix Mendelssohn. The music was written on coloured sheets of paper, and illustrated by her husband Wilhelm Hensel.

She also wrote, amongst other works for the piano, a cycle of pieces depicting the months of the year, Das Jahr ("The Year"). Her piano works are often in the manner of songs, and many carry the name Lieder für das Pianoforte ( Songs for the piano, a parallel to Felix's Songs without Words). A number of her songs were originally published under her brother, Felix Mendelssohn's, name in his opus 8 and 9 collections. Her compositions include a piano trio and several books of solo piano pieces and songs. Fanny Mendelssohn (14 November 1805 – ), later Fanny Mendelssohn Bartholdy and, after her marriage, Fanny Hensel, was a German pianist and composer.
