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of the slight difference in the last measure and a half. The next two systems (3rd and 4th) are almost identical as well, but present a new musical idea entirely different from that in the song's first half. We call the third system B and the fourth system B' because of the slight difference in the last measure and a half. As a whole, this piece of music is in binary form: AA´BB´.

Ternary form

Ternary form is a three-part musical form in which the third part repeats or at least contains the principal idea

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