Wolfgang Amadeus Mozart's Oboe Concerto in C major, K. 314 was originally composed in Spring or Summer 1777 for oboist Giuseppe Ferlendis (1755–1802) from Bergamo, then reworked by the composer as a concerto for flute in D major in 1778. The concerto is a widely-studied piece for both instruments and is one of the more important concerti for the oboe.
As with his Flute Concerto No. 1, the piece is arranged for a standard set of orchestral strings, two oboes, and two horns.
The piece itself is divided into three movements:
Flute Concerto No. 2
The Flute Concerto No. 2 in D Major is an adaptation of the original oboe concerto. Dutch flautist Ferdinand De Jean (1731–1797) commissioned Mozart for four flute quartets and three flute concerti; which Mozart only completed three quartets and only one new flute concerto. Instead of creating a new second concerto, Mozart rearranged the oboe concerto he had written a year earlier as the second flute concerto, although with substantial changes to it to fit what the composer deemed flute-like. However, De Jean did not pay Mozart for this concerto because it was based on the oboe concerto.
While the original version for oboe had been lost before Alfred Einstein wrote Mozart: His Character, His Work, the oboe origin of the flute concerto was suspected then, in part because of references in letters to a now-missing oboe concerto, as Einstein wrote, and of similar details in the orchestral string lines which suggested a transposition was used. Also, Einstein noted the two scores in D Major and C Major of the K. 314 Concerto in the Library of the Gesellschaft der Musikfreunde in Vienna, which led to the belief that the oboe concerto was the origin of the flute concerto. The orchestra parts of the composition and solo oboe part in C were rediscovered by Bernhard Paumgartner in Salzburg, in 1920.