In music, the conclusion is the ending of a composition and may take the form of a coda or outro.
In all musical forms other techniques include "altogether unexpected digressions just as a work is drawing to its close, followed by a return...to a consequently more emphatic confirmation of the structural relations implied in the body of the work.
"[1] For example: Coda (Italian for "tail", plural code) is a term used in music in a number of different senses, primarily to designate a passage which brings a piece (or one movement thereof) to a conclusion.
It is very difficult to approximate this effect on an instrument such as the piano, but instrumentalists can simulate it by thinning the musical texture while applying diminuendo within the limits of their instruments, and by taking advantage of the open-ended feeling of an unresolved harmony or melodic tone at the end.
Repeat and fade endings are rarely found in live performances, but are often used in studio recordings.