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In music, development is a process by which a musical idea is transformed and restated in the course of a composition. Certain central ideas are repeated in different contexts or in altered form so that the listener can consciously or unconsciously compare the various statements of the idea, often in surprising or ironic manners. This practice has its roots in counterpoint, where a theme or subject might create an impression of a pleasing or affective sort, but delight the mind further as its contrapuntal capabilities are gradually unveiled.

Development is often contrasted with musical variation, which is a slightly different means to the same end. Development is carried out upon portions of material treated in many different presentations and combinations at a time, while variation depends upon one type of presentation at a time.

The development is the middle section of the sonata form, between the exposition and the recapitulation; in some older texts, this section may be referred to as free fantasia.

Methods of development

According to the Oxford Companion to Music there are several ways of developing a theme. These include:

• The division of a theme into parts, each of which can be developed in any of the above ways or recombined in a new way. Similarly, two or more themes can be developed in combination; in some cases, themes are composed with this possibility in mind.
• Alteration of pitch intervals while retaining the original rhythm.
• Rhythmic displacement, so that the metrical stress occurs at a different point in the otherwise unchanged theme.
• Sequence, either diatonically within a key or through a succession of keys.

The Scherzo movement from Beethoven's Piano Sonata No. 15 in D major, Op 28 (the "Pastoral" Sonata) shows a number of these processes at work on a small scale. Charles Rosen (2002) marvels at the simplicity of the musical material: "The opening theme consists of nothing but four F sharps in descending octaves, followed by a light and simple I/ii/V7/I cadence with a quirky motif repeated four times." These opening eight bars provide all the material Beethoven needs to furnish his development, which takes place in bars 33-48:

The division of a theme into parts

The falling octave in the first two bars and the repeated staccato chord in the left hand in bars 5-8 are the two fragments that Beethoven later develops:

Alteration of pitch intervals

The somewhat bald falling octave idea in the first four bars is transformed in bars 33-36 into an elegant shape ending with an upward-curving semitone:

Rhythmic displacement

In this movement, the repeated left hand chords in bar 5 are displaced so that in bar 33 onwards, they fall on the 2nd and 3rd beats:

Sequence and the development of two or more themes in combination

In bars 33-48, the two fragments combine and the development goes through a modulating sequence that touches on a succession of keys;

The following outline demonstrates Beethoven’s strategic planning, which he applied on a larger scale in the development sections of some of his major works. The bass line traces a decisive progression through a rising chromatic scale:

To quote Rosen again, writing à propos of this movement: "As Beethoven's contemporary, the painter John Constable, said, making something out of nothing is the true work of the artist."

Development on a larger scale

Not all development takes place in what is commonly known as the "development section" of a work. It can take place at any point in the musical argument. For instance, the “immensely energetic sonata movement” that forms the main body of the overture to Mozart’s Opera Don Giovanni announces the following theme during the initial exposition. It consists of two contrasting phrases: “first determined, then soft and conspiratorial.”

William Mann says “the first, insistent phrase is very important. At once it is taken up imitatively by various departments of the orchestra, and A major, jumps through several related keys.” Each repetition of the descending phrase is subtly altered one note at a time, causing the music to pass from the key of A major, through A minor and thence via a chord of G7 to the remote key of C major, and thence back to A major.

The central section of the Overture (the part commonly known as the "development section") utilizes both phrases of the theme “in new juxtapositions and new tonalities,” developing it through repetition in a modulating sequence. The steady plod of the bass line against the sequential repetitions of the “soft and conspiratorial” phrase outlines a circle of fifths chord progression:

Simultaneously, Mozart adds to the mix and continues to develop the imitative counterpoint that grew out of the first phrase. In the words of Willam Mann, this development “unites both halves” of the theme. This is how this tightly woven texture pans out:

See also

• Developing variation
• Fugue § Development
• Secondary development
• Sequence (music)

References

1. Benward & Saker (2009), Music in Theory and Practice: Volume II, p.138-39. Eighth Edition. ISBN 978-0-07-310188-0.
2. Wennerstrom, Mary (1975). "Form in Twentieth-Century Music" (chap. 1), Aspects of Twentieth-Century Music. Wittlich, Gary (ed.). Englewood Cliffs, New Jersey: Prentice-Hall. ISBN 0-13-049346-5.
3. Temperley, N. (2002, p. 355) “Development” in Oxford Companion to Music. Oxford University Press.
4. Rosen, C. (2002, p.161), Beethoven's Piano Sonatas, a Short Companion. Yale University Press.
5. Rosen, C. (2002, p.162), Beethoven's Piano Sonatas, a Short Companion. Yale University Press.
6. Mann, W. (1977, p. 462) the Operas of Mozart. London, Cassell.
7. Mann, W. (1977, p. 462) the Operas of Mozart. London, Cassell.
8. Mann, W. (1977, p. 462) the Operas of Mozart. London, Cassell.
9. Taruskin, R. (2005, p.488) The Oxford History of Western Music, Volume 2 Music in the seventeenth and Eighteenth Centuries. Oxford University Press.
10. Mann, W. (1977, p. 462) the Operas of Mozart. London, Cassell.
11. Mann, W. (1977, p. 462) the Operas of Mozart. London, Cassell.

v t e Musical form and development
Arch form Argument Ausmultiplikation Bar form Binary form Bridge Call and response Cell Coda Conclusion Cycle Cyclic form Developing variation Development Drop Exposition Finale Formula composition Hook Introduction Leitmotif Lick Melody Motif Movement Ostinato Overture Period Phrase Pre-chorus Post-chorus Recapitulation Repetition Reprise Riff Rondo Rondò Section Sonata form Sonata rondo form Song structure Strophic form Ternary form Theme Thirty-two-bar form Through-composed Transition Variation Verse–chorus form

• Musical development
• Formal sections in music analysis