Josepha Barbara Auernhammer (also Aurnhammer) was born in Vienna on September 25, 1758 to Johann Michael Auernhammer and Elizabeth Timmer. Her first music teachers were Georg Friedrich Richter (or Joseph Richter) and the Bohemian pianist Leopold Anton Kozeluch. In 1781 her family took in a border, newly arrived in Vienna, named Wolfgang AmadeusMozart and she became one of his first students in this city.
In Mozart’s many letters to his father this year he frequently mentioned her. It seems that she had a sound technical facility, but he noted “in cantabile playing she has not got the real delicate singing style”. Soon, though, he declared that he was thoroughly pleased with her progress and delighted with her keyboard skills.
In June of 1781 Mozart asked his father to copy and send several of his works to him, including the concerto for two pianoforte in E flat major (K365). By September the composer reported that Josepha was “worrying me to death” about the piece —apparently it had not yet arrived — and only on October 13 did he write home to say that he and Fräulein Auernhammer were grateful to have received it. They went on to perform it at the Auernhammers’ home in Vienna on November 23, 1781, and also on May 26, 1782. Included in the November concert was the brilliant concertante, Sonata in D, K. 448, for two pianos, written specifically for this concert. It is an indication of her great skill that Mozart wrote the "primo" part for her.
In 1786 Josepha married Johann Bessenig (ca. 1752-1837), with whom she had four children. She retained her maiden name in her professional life as a concert pianist in Vienna and as a composer. She ranked alongside the most renowned artists in Vienna and from the 1790’s gave regular concerts in the Burg Theater. Her last public performance was on March 21, 1813 in the Burg Theater. It included her daughter, Marianna, who became a professional singer under the name Auenheim and taught voice and composition in Vienna.
As a composer Josepha wrote a set of six German songs, a violin and piano sonata, piano sonatas and duets and a dozen sets of variations, the best known being the set of six variations on 'Der Vogelfanger bin ich ja’ from Mozart’s Die Zauberflote, published in 1793 (available from Hildegard Publishing Co.). Her works are known for their comprehensive knowledge of piano technique and artful use of the instrument.