Binary format
In Classical music, the binary format is a musical structure particular of the musical work made up of two sections - has and B - carried out twice each one, that is to say: AA' BB'. On a partition, the binary format is generally noted by means of repeat marks.
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the section has is usually completed in a close tonality - very often, the Tonalité of the Dominante.
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the section B on the contrary, starts with this close tonality, and, after a variable number of modulations, is completed on the starting tonality.
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the two sections can be equal length. When it is not the case, it is the section B which is generally longer: this one indeed is often richer, initially because it contains more modulations, then because it frequently uses part of the material set of themes of section A.
An example of binary format is provided by the parts of the traditional continuation which generally adopt it (one can find the form rondo also there).
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