Cyclical Forms
Opera was originally modelled upon classical drama and takes much of its form from its libretto and narrative. For many years, ballet was a component of opera, not in itself narrative, but having the form of a suite of set dances included at some appropriate moment in the story such as a festival or wedding. It emerged as a separate form, supplying its own narrative or representation, during the 19th-century. At the same time, the song cycle emerged, which is a set of related songs (as the suite is a set of related dances). The oratorio took shape as a narrative, often religious, recounted—rather than acted—by the singers.
The sonata, symphony, and concerto were all developed by major composers of the Viennese school (Haydn, Mozart and Beethoven primarily) along the same formal lines into distinctively musical forms limited little by the forms of song, dance or ceremony. Other forms of music, such as the Catholic mass and requiem, are largely shaped by, and subordinated to, their texts and ceremonial functions.
Read more about this topic: Musical Form
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