In the days of Mozart the favorite amusement of wealthy amateurs of music was the string quartet. Haydn was the man who first showed the way, although Boccherini should not be utterly forgotten. The set of six dedicated by Mozart to Haydn, show the growth of the quartet, the individualizing of each part. For in the ideal work of this species, each part should be of equal importance. This advance, however, was not to the public taste. He was accused of undue originality. Prince Grassalcovicz was so angry when he found that the discords coming from the players were actually in the parts, that he tore the pages in pieces. The publisher returned them, as full of printer's errors. Learned men, as Fétis and G. Weber, have written learned analyses of the introduction to the quartet in C major, against it and in its favor. The hearers of to-day, accustomed to the last quartets of Beethoven and the licenses of modern composers, are not shocked even by the celebrated false relations in the aforesaid introduction. Not only do these compositions display, in clearest light, the mastery of form and all contrapuntal devices; they are a mine of sensuous and spiritual riches. The quartet is ennobled; the minuet, that jolly, rustic dance of Haydn, becomes, with Mozart, the court dance of noble dames, full of grace and delicacy. The finales abound in dignified humor, and occasionally pathos is found. Upon these six quartets Mozart lavished the treasures of his nature and his art. In writing the three for Frederick William II. of Prussia, he remembered the favorite instrument of the monarch, and brought the violoncello into greater prominence, making it often a solo instrument, with the melody in its higher notes. This necessitated a different treatment of the violins and viola, and resulted in more brilliancy with an occasional loss of strength. Written, as they were, to gratify the taste of a monarch, they show more elegance, perhaps, than depth of feeling, but in invention and in exquisite proportion they are worthy of even the great name of Mozart. Without stopping to examine as carefully as it deserves the remarkable trio for violin, viola, and violoncello (K. 563), in six movements, let us glance at the quintets, in which the viola is doubled, unlike the many compositions of Boccherini in which two 'cellos are employed. The quintets in C major and G minor were composed in 1787, the D major in 1790, the E-flat major, 1791. These four quintets follow the path pointed out by the six quartets. There are biting and harsh passages, to impress more forcibly the composer's intentions, "comparatively frequent successions of ninths in a circle of fifths." And even Mozart seldom wrote anything so full of wild and sobbing passion as the first movement of the G-minor quintet, in which the second subject is of an Italian intensity and a conviction that remind one of the terrible earnestness of Verdi, the Verdi of the middle period. Yet this melody,