Mozart: The 4 Symphonies in D
Symphony No. 11 in D major, K. 84/73q, was at one time considered unquestionably to be the work of Wolfgang Amadeus Mozart. Its status has, however, been challenged, and (as of 2008) remains uncertain. It is believed to date from 1770 and may have been written in Milan or Bologna if it is a genuine Mozart work. An early manuscript from Vienna attributes the work to Wolfgang, but nineteenth-century copies of the score attribute it respectively to Leopold Mozart and to Carl Dittersdorf. Neal Zaslaw writes: "A comparison of the results of two stylistic analyses of the work's first movement with analyses of unquestionably genuine first movements of the period by the three composers suggests that Wolfgang is the most likely of the three to have been the composer of K73q".
Symphony 44. This symphony is scored for 2 oboes, 2 horns, and strings and is in 3 movements. If bassoons and a harpsichord were available, these instruments were used to reinforce the bass line. The horns are silent for the 2nd and 3rd movements.
Symphony 47 was also composed in Rome in 1770 and is scored for 2 oboes, 2 trumpets, and strings. In the 2nd movement, the trumpets are silent and the oboes are replaced by flutes.
Symphony 45 was also composed in Rome in 1770. As with Symphony 47, the symphony is scored for 2 oboes, 2 trumpets, and strings. The trumpets are silent in the 2nd movement and the oboes are replaced by flutes. Since the orchestration is identical, symphonies 47 and 45 are considered twin symphonies.