**Balanced binary** form creates an *end rhyme* between the two reprises. Material heard near the end of the first reprise in a secondary key returns near the end of the second reprise in the tonic key. Both [[simple binary|simple]] and [[rounded binary]] forms may be balanced; however, balanced organization typically does not apply to sectional [[binary forms]]. In the diagrams below, the superscripts 1 and 2 indicate tonic and non-tonic keys, respectively. There are two subtypes. The first is what Hepokoski and Darcy (2006: 355) call **parallel binary**, in which the second reprise repeats the opening material of the first reprise in a non-tonic key: $ \text{||: a}^{1}\text{ + b}^{2}\text{ :||: a}^{2}\text{ + b}^{1}\text{ :||} $ The second is considered simply **balanced binary**, which features new material at the opening of the second reprise: $ \text{||: a}^{1}\text{ + b}^{2}\text{ :||: c}^{2}\text{ + b}^{1}\text{ :||} $ ## References Hepokoski, James, and Warren Darcy. 2006. *Elements of Sonata Theory: Norms, Types, and Deformations in the Late-Eighteenth-Century Sonata*. New York: Oxford University Press.