Mozart Symphony No. 34 in C Major, K. 338 Jump to search Symphony No. 34 in C major, K. 338, was written by Wolfgang Amadeus Mozart in 1780, and completed on 29 August.[1][2] The work is scored for 2 oboes, 2 bassoons, 2 horns, 2 trumpets, timpani and strings. Although most symphonies have four movements, this symphony has only three, which was still common in the early classical period: Allegro..