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Coda (Italian for "tail", plural code) is a term used in music in a number of different senses, primarily to designate a passage that brings a piece (or one movement thereof) to a conclusion. "Technically an expanded cadence. Occurs at the end of a composition and traditionally brings the composition to a convincing conclusion. May consist of a few measures or an entire subdivision in itself.".
Coda as a section of a movement
The presence of a coda as a structural element in a music movement is especially clear in works written in particular musical forms. In a sonata form movement, the recapitulation section will, in general, follow the exposition in its thematic content, while adhering to the home key. The recapitulation often ends with a passage that sounds like a termination, paralleling the music that ended the exposition; thus, any music coming after this termination will be perceived as extra material, i.e., as a coda. In works in variation form, the coda occurs following the last variation and will be very noticeable as the first music not based on the theme.
Codas were commonly used in both sonata form and variation movements during the Classical era. One of the ways that Beethoven extended and intensified Classical practice was to expand the coda sections, producing a final section sometimes of equal musical weight to the foregoing exposition, development, and recapitulation sections and completing the musical argument. For one famous example, see Symphony No. 8 (Beethoven).
The musical function of codas
Charles Burkhart suggests that the reason codas are common, even necessary, is that, in the climax of the main body of a piece, a "particularly effortful passage", often an expanded phrase, is often created by "working an idea through to its structural conclusions" and that, after all this momentum is created, a coda is required to "look back" on the main body, allow listeners to "take it all in", and "create a sense of balance."
In music notation
In music notation, the coda symbol, which resembles a set of crosshairs, is used as a navigation marker, similar to the dal Segno sign. It is used where the exit from a repeated section is within that section rather than at the end. The instruction "To Coda" indicates that, upon reaching that point during the final repetition, the performer is to jump immediately to the separate section headed with the coda symbol. For example, this can be used to provide a special ending for the final verse of a song.
This symbol is encountered mainly in modern music, not works by classical composers such as Haydn or Mozart.
Cauda, the Latin root of coda, is used in the study of conductus of the 12th and 13th centuries. The cauda was a long melisma on one of the last syllables of the text, repeated in each strophe. Conducti were traditionally divided into two groups, conductus cum cauda and conductus sine cauda (Latin: "conductus with cauda", "conductus without cauda"), based on the presence of the melisma. Thus, the cauda provided a conclusionary role, also similar to the modern coda.
Codetta (Italian for "little tail," the diminutive form) has a similar purpose to the coda, but on a smaller scale, concluding a section of a work instead of the work as a whole. A typical codetta concludes the exposition and recapitulation sections of a work in sonata form, following the second (modulated) theme, or the closing theme (if there is one). Thus, in the exposition, it usually appears in the secondary key, but, in the recapitulation, in the primary key. The codetta ordinarily closes with a perfect cadence in the appropriate key, confirming the tonality. If the exposition is repeated, the codetta is also, but sometimes it has its ending slightly changed, depending on whether it leads back to the exposition or into the development sections.
Codas in popular music
Many songs in rock and other genres of popular music have sections identifiable as codas. A coda in these genres is sometimes referred to as an outro and in jazz and modern church music as a tag. See also fade out.
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