Final answer:
Developing Variation refers to Arnold Schoenberg's technique of transforming musical themes organically, rather than following traditional theme-and-variations structures.
Step-by-step explanation:
The phrase 'Developing Variation' refers to a concept in music composition, notably used by the Austrian composer Arnold Schoenberg. Schoenberg explored groundbreaking techniques in his work, such as atonality and the twelve-tone scale. Developing Variation is essentially a process where musical ideas are continually transformed and evolved, rather than being presented in a straightforward theme-and-variations structure.
It allows for a more intricate and organic development within a piece, reflecting Schoenberg's desire to break away from the traditional western music scales and expectations to create a more expressive and avant-garde form of music.