 Around the same time, the composer also developed a type of a tone row technique with 25-note rows.After studies with Schoenberg, who never taught dodecaphony to his students, Cage developed another tone row technique, in which the row was split into short motives, which would then be repeated and transposed according to a set of rules.This approach was first used in "Two Pieces for Piano" (c. 1935), and then, with modifications, in larger works such as "Metamorphosis" and "Five Songs" (both 1938).