Otto Jahn, Life of Mozart, Vol. 1 (of 3)
“ In Vienna, of all places, the birthplace and domain of Haydn's chamber-music, the ambitious youth would exert himself to satisfy the demand for the highest class of compositions. Most of them have the approved four movements, and the composer's invention and execution keep pace with the more extended scope of the composition. The quartets are manlier and more mature than in the earlier works of the kind; but the singular beauty of form, the grace and freshness of Mozart in his full development, only show themselves in momentary gleams of inspiration. ”
