Quartet Quartet In music, a quartet or quartette (, , , , ) is an ensemble of four singers or instrumental performers; or a musical composition for four voices or instruments. In Classical music, the most important combination of four instruments in chamber music is the string quartet. String quartets most often consist of two violins, a viola, and a cello. The particular choice and number of instruments derives from the registers of the human voice: soprano, alto, tenor and bass. In the string quartet, two violins play the soprano and alto vocal registers, the viola plays the tenor register and
String Quartet No. 20 (Mozart) King Frederick William II of Prussia (the first edition bore no dedication, however), is often polyphonic in a way uncharacteristic of the earlier part of the classical music era. The menuetto and its trio give good examples of this in brief, with the brief irregular near-canon between first violin and viola in the second half of the main portion of the minuet, and the double imitations (between the violins, and between the viola and cello) going on in the trio. String Quartet No. 20 (Mozart) The String Quartet in D major, K. 499, was written in 1786 in Vienna by