A final, concluding section to a composition which is extraneous to the main structure; a coda goes beyond the essential harmonic or formal closure of a piece providing a supplimentary expression of finality with artistic style.
generally a final sort of epsiode after the last complete subject entry: that is, it is subject free. May have fragments such as the head or the tail, or may present a hybrid where subject and countersubject or episode motive merge in some new combination. A flourish.
if the music continues after a strong cadential close.
Although all fugues come to a cadential resolution, not all fugues have formal codas. Many end precisely with the last note of the last subject entry, or with but a few additonal beats to tie up the loose ends.
may or may not echo the subject, countersubjects, etc. tail.
Many Classical music compositions, particularly Romantic sonatas, use extended codas that even present new points of departure, development and a final conclusion. A coda in a Bach fugue is much more conservative, generally not exceeding the length of a modest episode nor introducing anything that is not clearly cadential.
Though coda and codetta are related, they are quite different. Their chief difference is that a coda gives closure to the entire composition, a codetta a much smaller weight preparation for internal closure, specifically within an exposition.
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