Coda and Introduction
Some sonata movements feature a parageneric space. Everything in the movement that may set up or otherwise alter or frame the presentation of the sonata form is a parageneric space. In such a movement, the most frequently encountered parageneric space are accretions, which in the second half of the eighteenth century came to be increasingly attractive options as add-ons to the basic structure; the most common are codas and introductions. The coda is a parageneric space that stands outside the sonata form. Sometimes codas are little more than emphatic, tonic-prolongational tags. Codas are also used if the composer wants to say something more. Although its length may vary, the shorter codas were the norm before longer ones began to appear, and when a coda is lengthy it is referred to as a discursive coda.
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