<P> The Romantic era in music was to accept the centrality of this practice, codify the form explicitly and make instrumental music in this form central to concert and chamber composition and practice, in particular for works that were meant to be regarded as "serious" works of music . Various controversies in the 19th century would center on exactly what the implications of "development" and sonata practice actually meant, and what the role of the Classical masters was in music . It is ironic that, at the same time that the form was being codified (by the likes of Czerny and so forth), composers of the day were writing works that flagrantly violated some of the principles of the codified form . </P> <P> It has continued to be influential through the subsequent history of classical music through to the modern period . The 20th century brought a wealth of scholarship that sought to found the theory of the sonata form on basic tonal laws . The 20th century would see a continued expansion of acceptable practice, leading to the formulation of ideas by which there existed a "sonata principle" or "sonata idea" that unified works of the type, even if they did not explicitly meet the demands of the normative description . </P> <P> Sonata form shares characteristics with both binary form and ternary form . In terms of key relationships, it is very like binary form, with a first half moving from the home key to the dominant and the second half moving back again (this is why sonata form is sometimes known as compound binary form); in other ways it is very like ternary form, being divided into three sections, the first (exposition) of a particular character, the second (development) in contrast to it, the third section (recapitulation) the same as the first . </P> <P> The early binary sonatas by Domenico Scarlatti provide excellent examples of the transition from binary to sonata - allegro form . Among the many sonatas are numerous examples of the true sonata form being crafted into place . </P>

The third movement of a four-movement sonata could be in which form
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