56[1]", K. 98/Anh.C 11.04,[2] was once thought to have been written by Wolfgang Amadeus Mozart, but today is regarded as spurious.
The symphony consists of the following movements: In Vienna, an unknown person (possibly Franz Lorenz) compiled a "Sistematisch-Thematisches Verzeichnis der sämtlichen Compositionen von Wolfgang Amadeus Mozart" ("Systematic Thematic Catalogue of all composition by Wolfgang Amadeus Mozart").
[5] Ludwig Ritter von Köchel, who only knew the work in an arrangement for two pianos, considered the work authentic and included it into the first edition of the Köchel catalogue.
Wyzewa and Saint-Foix did not doubt the work's authenticity, but believed that Mozart only sketched the symphony and did not write it out completely.
[6] In his revision of Otto Jahn's Mozart biography Hermann Abert stated that the symphony was probably doubtful, listing many things uncharacteristic of Mozart's works and characteristic of other Mannheim composers, even noting a favourite phrase of Johann Stamitz in the beginning of the trio of the minuet.