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| | ipedia.com: Ternary form Article |
 | | Ternary form is a way of structuring a piece of music. |  | | It is also the form used in the minuet (or scherzo) and trio, which in the classical music era was usually the third movement of symphonies, string quartets, sonatas and similar works. |  | | Less commonly, the trio may also be in a different time signature (3/4 as opposed to the 2/4 of the march, for example). |
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http://www.ipedia.com/ternary_form.html
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| | Aria |
 | | Composers also wrote "concert arias", not part of any larger work, such as "Ah Perfido" by Beethoven and a number of concert arias by Mozart. |  | | In the 17th century, the aria was written in ternary form (ABA); these arias were known as da capo arias. |  | | Perhaps the most common context for arias is opera; there are also many arias that form movements of oratorios and cantatas. |
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http://www.brainyencyclopedia.com/encyclopedia/a/ar/aria.html
(241 words)
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