Rounded Binary Form	Theory Things   William Wieland
Continuous or Open Rounded Binary
Like binary, rounded binary is often a continuous or open form meaning the two principle sections modulate. However, the first section may cadence on tonic. Like ternary, rounded binary features a recapitulation of the opening material, either partial or complete. A common pattern is   ||: a   a'  :||: b   a''  :|| Rounded binary is a precursor of sonata form.