The third section of this piece returns to the original melodic material, making the work an example of what kind of form is ternary. A three-part musical structure known as ternary form, also referred to as song form, consists of an opening portion (A), a piece that comes after it (B), and a repetition of the first section (A). A-B-A is the typical schematization.
In music, a ternary form is a structure of three pieces, with the third section typically being either a direct or varied repetition of the first. One of the well-known shapes in Western music is provided by the symmetrical structure of this scheme (aba); ternary form can be found in music from the Middle Ages (such as in the typical arrangement antiphon-verse-antiphon in Gregorian chant) to the present.
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