Editing Binary form (section)

===Simple vs. rounded=== <!--[[Minuet form]] redirects directly here.-->
[[File:Oh, Susannah rounded binary form.png|thumb|400px|"[[Oh! Susanna|Oh, Susannah]]": rounded binary form.<ref>[[Stefan Kostka|Kostka, Stefan]] and Payne, Dorothy (1995). ''Tonal Harmony'', p. 343. 3rd edition, McGraw-Hill. {{ISBN|0-07-035874-5}}.</ref>[[File:Oh, Susannah rounded binary form.mid]]]]

Occasionally, the ''B'' section will end with a "return" of the opening material from the ''A'' section. This is referred to as '''rounded binary''', and is labeled as ''ABA''<nowiki>′</nowiki>. In rounded binary, the beginning of the ''B'' section is sometimes referred to as the "bridge", and will usually conclude with a [[half cadence]] in the original key. Rounded binary is not to be confused with [[ternary form]], also labeled ''ABA''—the difference being that, in ternary form, the ''B'' section contrasts completely with the ''A'' material as in, for example, a [[Minuet#Minuet_and_trio|minuet and trio]]. Another important difference between the rounded and ternary form is that in rounded binary, when the "A" section returns, it will typically contain only half of the full "A" section, whereas ternary form will end with the full "A" section.

Sometimes, as in the keyboard sonatas of [[Domenico Scarlatti]], the return of the ''A'' theme may include much of the original ''A'' section in the tonic key, so much so that some of his sonatas can be regarded as precursors of sonata form.

Rounded binary form is sometimes referred to as small ternary form.<ref name="Schoenberg">[[Arnold Schoenberg|Schoenberg, Arnold]] (1967). ''Fundamentals of Musical Composition'', p. 119. {{ISBN|0-571-09276-4}}.</ref>

Rounded binary or '''minuet form''':<ref name="Rosen">[[Charles Rosen|Rosen, Charles]] (1988). ''Sonata Forms'', p. 29. {{ISBN|0-393-30219-9}}.</ref>
 A      :||: B                           A or A'
 I(->V) :||: V(or other [[closely related key|closely related]]) I

If the ''B'' section lacks such a return of the opening ''A'' material, the piece is said to be in '''simple binary'''.

Simple:<ref name="Rosen"/>
 A->B :||: A->B
 I->V :||: V->I

Slow-movement form:<ref name="Rosen"/>
 A'        A"
 I->V      I->I

Many examples of rounded binary are found among the church sonatas of Vivaldi including his Sonata No. 1 for Cello and Continuo, First Movement, while certain Baroque composers such as Bach and Handel used the form rarely.<ref>White (1976) pp. 51–52</ref>