 The singer uses a technique called Sprechstimme, halfway between speech and song.After developing the twelve-tone technique, Schoenberg wrote a number of chamber works, including two more string quartets, a string trio, and a wind quintet.He was followed by a number of other twelve-tone composers, the most prominent of whom were his students Alban Berg, who wrote the "Lyric Suite" for string quartet, and Anton Webern, who wrote "Five Movements for String Quartet", op.