Quartet -

: Consists of two violins (first and second), one viola, and one cello.

: Franz Joseph Haydn is credited with establishing the modern form in the 1750s. Quartet

In global politics, "The Quartet" refers to a group of four entities established in 2002 to mediate the . Report of the Middle East Quartet - the United Nations : Consists of two violins (first and second),

: Adds a "mellow" middle voice between the violins and cello. Cello : Provides the "bass" or foundation for the sound. Top String Ensembles Quartet