Wolfgang Amadeus Mozart (1756-1791)
The 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.
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.