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. 15 (Villa-Lobos) String Quartet No. 15 (Villa-Lobos) String Quartet No. 15 is one of a series of seventeen works in the medium by the Brazilian composer Heitor Villa-Lobos, and was written in 1954. A performance lasts approximately nineteen minutes. Villa-Lobos composed his Fifteenth Quartet in 1954, working on it at the Tamanaco Hotel in Caracas, Venezuela and completing the score in New York. It was first performed by the Juilliard String Quartet (Robert Mann and Isidore Cohen, violins; Raphael Hillyer, viola; Claus Adam, cello) on 19 April 1958 in the Coolidge Auditorium of the Library of Congress, Washington, D.C., as part of