"Bartok, an earlier Eastern European master, is also known for his sometimes brusquely compact compositional style. Bartok's String Quartet No. 4 seemed positively loquacious. Here were complete phrases laid out with the logic of a well-constructed paragraph." -New York Times

This work is in a so-called "arch" structure - the first movement is thematically related to the last, and the second to the fourth with the third movement standing alone. Also, the outer four movements feature rhythmic sforzandos that cyclically tie them together in terms of climatic areas. The playing time for the movements are [generally] 5, 2, 5, 2, 5 minutes respectively, a display of the mathematical logic behind this quartet.

The quartet employs a number of extended instrumental techniques; for the whole of the second movement all four instruments are played with mutes, while the entire fourth movement is played pizzicato. In the third movement, Bartók sometimes indicates held notes to be played without vibrato, and in various places he asks for glissandi (sliding from one note to another) and so-called Bartók pizzicati
.-Source Wikipedia
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