Beethoven wrote nine symphonies, the first heralding the new century, in 1800, and the last completed in 1824. Although he made few changes to the composition of the orchestra itself, adding, when occasion demanded, one or two instruments more normally found in the opera-house, he expanded vastly the traditional form, developed in the time of Haydn and Mozart, reflecting the personal and political struggles of a period of immense change and turbulence. To his contemporaries he seemed an inimitable original, but to a number of his successors he seemed to have expanded the symphony to an intimidating extent.