W. S. B. Mathews,
The Masters and Their Music
“ There is one form in modern music which is the type of so large a proportion of extended instrumental movements that the student will do well to master its peculiarities at the earliest possible moment. This is the form sometimes called the sonata form or sonata-piece. The term sonata was originally used in two senses: in its larger sense it indicates an extended musical composition with three or four movements, all which taken together form the sonata. By the term sonata-piece, however, is meant the particular movement of the sonata which gives the name to the whole piece. ”
