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Modulation (music)
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==Significance== In certain [[european classical music|classical music]] forms, a modulation can have structural significance. In [[sonata form]], for example, a modulation separates the first subject from the second subject. Frequent changes of key characterize the [[musical development|development]] section of sonatas. Moving to the [[subdominant]] is a standard practice in the [[trio (music)|trio]] section of a [[march (music)|march]] in a major key, while a minor march will typically move to the relative major. Changes of key may also represent changes in mood. In many genres of music, moving from a lower key to a higher often indicates an increase in energy. Change of key is not possible in the [[full chromatic]] or the [[twelve tone technique]], as the modulatory space is completely filled; i.e., if every pitch is equal and ubiquitous there is nowhere else to go. Thus other differentiating methods are used, most importantly ordering and [[permutation (music)|permutation]]. However, certain pitch formations may be used as a "tonic" or home area.
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