There can have been little personal intercourse between them, for Haydn was rarely in the capital, and Mozart seems never to have visited Eisenstadt; but the cordiality of their relations and the mutual influence which they exercised upon one another are of the highest moment in the history of 18th-century music. " It was from Haydn that I first learned to write a quartet," said Mozart; it was from Mozart that Haydn learned the richer style and the fuller mastery of orchestral effect by which his later symphonies are distinguished.
The beautiful sounds of The Coleman Hawkins Quartet doing "The Man I Love" as it ought to be done were playing and Mrs. Lincoln never looked more content.
Here Haydn wrote, in rapid succession, eighteen divertimenti which include his first symphony and his first quartet; the two earliest examples of the forms with which his name is most closely associated.
Classical and modern chamber-music in the sonata style consists mainly of string-quartets for 2 violins, viola and violoncello; string-trios (rare, because very difficult to write sonorously); pianoforte-trios (pianoforte, violin and violoncello); pianoforte-quartets (pianoforte with string-trio); pianoforte-quintets (pianoforte with string-quartet); string-quintets (with 2 violas, very rarely with 2 violoncellos), and (in two important cases by Brahms) stringsextets.
The ministry of war has its offices in the immense military quartet (barracks) on the north side of the Praga da Republica, and the ministry of marine in the naval arsenal at the foot of Sao Bento Hill.