Symphony, K. 74g (Mozart)

This symphony (among others) was known to Ludwig Ritter von Köchel only by an incipit in the catalogue of Breitkopf & Härtel, and so he placed it in the Anhang of the Köchel catalogue as Anh. 216. A set of parts (now lost) was discovered in the Berlin State Library in the early 20th century and was published by Breitkopf & Härtel in 1910 and edited by Max Seiffert. This set of parts may have been taken out of the library by Seiffert before they were catalogued (since the set of parts were never catalogued) and then never returned (this presumably went unnoticed as they had not been catalogued). Zaslaw speculates that the parts may have become part of the Berlinka art collection and joined other Mozart manuscripts in the Jagellonian Library in Kraków.

Due to the loss of the parts, the only source for this symphony was the Breitkopf & Härtel edition (from the Alte Mozart-Ausgabe). Max Seiffert wrote that in an old handwritten catalogue from Breitkopf & Härtel twelve symphonies that were once held in the publishing house are listed, but all had been lost and Köchel could only catalogue them in the appendix as Anh. 214–223 (overlooking two of them), but later two were found in the Berlin State Library, K. Anh. 214 and 216. They were dated 1770–1771, from Italy.

Alfred Einstein wrote in his edition of the Köchel catalogue that he believed that the symphony was composed between the two Italian journeys in early summer 1771 in Salzburg, gave the symphony the number "74g" and expressed no doubts as to Mozart's authorship. The sixth edition of the Köchel catalogue gave the symphony the number "Anh.C 11.03", putting it into the spurious and doubtful works category for stylistic reasons.

For the twelve symphonies (K. Anh. 214–223, K. Anh.C 11.07, and K. Anh.C 11.08) that were originally only known by an incipit in the Breitkopf & Härtel catalogue, the current statuses of their authenticity are:

K1	K6	GA No.	Key	Authenticity	Incipit (where the work is extant, incipit is on the work's own page)
Anh. 214	45b	55	B♭ major	Doubtful	see article
Anh. 215	66c	—	D major	Lost
Anh. 216 (K3. 74g)	Anh.C 11.03	54	B♭ major	Doubtful	see above
Anh. 217	66d	—	B♭ major	Lost
Anh. 218	66e	—	B♭ major	Lost
Anh. 219	Anh.C 11.06	—	D major	Spurious; actually by Leopold Mozart	not available
Anh. 220	16a	—	A minor	Doubtful	see article
Anh. 221	45a	—	G major	Unquestionably genuine	see article
Anh. 222	19b	—	C major	Lost and doubtful	see article
Anh. 223	19a	—	F major	Unquestionably genuine	see article
(K3. Anh. 223)	Anh.C 11.07	—	D major	Lost and doubtful
(K3. Anh. 223)	Anh.C 11.08	—	F	Lost and doubtful

(Symphonies which may have been written by Mozart have their Köchel numbers bolded.)

Some symphonies are still missing (K. 19b, 66c, 66d, 66e, Anh.C 11.07, and Anh.C 11.08), and some not in the catalogue of Breitkopf & Härtel were included into the main catalogue (K. 75, K. 76, K. 81, K. 95, K. 96, K. 97 and K. 98) despite the manuscripts being unauthorized. However, since these symphonies with unauthorised manuscripts (and K. 45b, which was discovered later) were considered to be by Mozart for stylistic reasons, it would be logical that these symphonies and K. 74g should either all be considered doubtful or all be considered authentic.[2]

The Neue Mozart-Ausgabe puts K. 74g in the supplement of "Works of Doubtful Authenticity" and includes a detailed discussion of the sources and authenticity so that, as with the other symphonies of uncertain authorship, a possible authorship of Mozart may be conceded with all due caution.

The symphony has been recorded by the Academy of Ancient Music and The English Concert.

• Sinfonie in B K. 74g: Score and critical report (in German) in the Neue Mozart-Ausgabe
• Pajot, Dennis (2007). "K074g (Anh 216) Symphony in B♭ – Doubtful to Authentic to Doubtful". Mozartforum.com. Archived from the original on 8 August 2007.