The instrumental music of the German composer Ludwig van Beethoven (1770-1827) forms a peak in the development of tonal music and is one of the crucial evolutionary developments in the history of music as a whole.

The early compositions of Ludwig van Beethoven marked the culmination of the 18th-century traditions for which Haydn and Mozart had established the great classical models, and his middle-period and late works developed so far beyond these traditions that they anticipated some of the major musical trends of the late 19th century. This is especially evident in his symphonies, string quartets, and piano sonatas.

In each of these three genres Beethoven began by mastering the existing formal and esthetic conventions of the late 18th century while joining to these conventions signs of unusual originality and power. In his middle period (from about 1803, the year of the Eroica Symphony, to about 1814, the year of...