Musical development
Musical development is the transformation and restatement of initial material, often contrasted with musical variation, with which it may be difficult to distinguish as a general process. However, development is carried out upon portions of material treated in many different presentations and combinations, while variation depends upon one type of presentation (DeLone et. al. (Eds.), 1975, chap. 1).The musical form which traditionally exploits development to the fullest is the sonata form, though development may be used with all other forms. The use of development is what separates the sectional binary form and ternary form from sonata form.