The symphonic orchestra comes from the string orchestra of the Baroque period which gradually expanded with oboes, bassoons, sometimes horns, trumpets and timpani. The classical period with François-Joseph Gossec, Joseph Haydn or Wolfgang Amadeus Mozart often sees the winds structured in pairs (2 flutes, 2 oboes, 2 clarinets, 2 bassoons, 2 horns, 2 trumpets).