 29, without intending in any way to recall Schubert's composition.There is evidence that Schoenberg regarded his 12-tone sets—independent of rhythm and register—as motivic in the commonly understood sense, and this has been demonstrated with particular reference to the second movement of this quartet.The piece was commissioned by Elizabeth Sprague Coolidge on March 2, 1927, though the work had already been completed by this time, and its première was given in Vienna on September 19, 1927, by the Kolisch Quartet.