In music, the conclusion is the ending of a composition and may take the form of a coda or outro. Pieces using sonata form typically use the recapitulation to conclude a piece, providing closure through the repetition of thematic material from the exposition in the tonic key. 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." (Perle 1990) The slow movement of Bach's Brandenburg Concerto No. 2, where a "diminished-7th chord progression interrupts the final cadence. The slow movement of Symphony No. 5 by Beethoven, where "echoing afterthoughts" follow the initial statements of the first theme and only return expanded in the coda. Varese's Density 21.5, where partitioning of the chromatic scale into (two) whole tone scales provides the missing tritone of b implied in the previously exclusive partitioning by (three) diminished seventh chords.

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