In musical form

Musical form

The term musical form refers to the overall structure or plan of a piece of music, and it describes the layout of a composition as divided into sections...

 and analysis

Musical analysis

Musical analysis is the attempt to answer the question how does this music work?. The method employed to answer this question, and indeed exactly what is meant by the question, differs from analyst to analyst, and according to the purpose of the analysis. According to Ian Bent , analysis is "an...

, exposition is the initial presentation of the thematic

Theme (music)

In music, a theme is the material, usually a recognizable melody, upon which part or all of a composition is based.-Characteristics:A theme may be perceivable as a complete musical expression in itself, separate from the work in which it is found . In contrast to an idea or motif, a theme is...

 material of a musical composition

Musical composition

Musical composition can refer to an original piece of music, the structure of a musical piece, or the process of creating a new piece of music. People who practice composition are called composers.- Musical compositions :...

, movement

Movement (music)

A movement is a self-contained part of a musical composition or musical form. While individual or selected movements from a composition are sometimes performed separately, a performance of the complete work requires all the movements to be performed in succession...

, or section

Section (music)

In music, a section is "a complete, but not independent musical idea". Types of sections include the introduction or intro, exposition, recapitulation, verse, chorus or refrain, conclusion, coda or outro, fadeout, bridge or interlude...

. The use of the term generally implies that the material will be developed

Musical development

In European classical music, musical development is a process by which a musical idea is communicated in the course of a composition. It refers to the transformation and restatement of initial material, and is often contrasted with musical variation, which is a slightly different means to the same...

 or varied

Variation (music)

In music, variation is a formal technique where material is repeated in an altered form. The changes may involve harmony, melody, counterpoint, rhythm, timbre, orchestration or any combination of these.-Variation form:...

.

• In sonata form
  Sonata form
  Sonata form is a large-scale musical structure used widely since the middle of the 18th century . While it is typically used in the first movement of multi-movement pieces, it is sometimes used in subsequent movements as well—particularly the final movement...
  
  , the exposition is "the very first major section, incorporating at least one important modulation to the dominant or other secondary key and presenting the principal thematic material."

• In a fugue
  Fugue
  In music, a fugue is a compositional technique in two or more voices, built on a subject that is introduced at the beginning in imitation and recurs frequently in the course of the composition....
  
  , the exposition is "the statement of the subject in imitation by the several voices; especially the first such statement, with which the fugue begins."

Exposition in classical sonata form

The term is most widely used as an analytical convenience to denote a portion of a movement identified as an example of classical tonal

Tonality

Tonality is a system of music in which specific hierarchical pitch relationships are based on a key "center", or tonic. The term tonalité originated with Alexandre-Étienne Choron and was borrowed by François-Joseph Fétis in 1840...

 sonata form

Sonata form

Sonata form is a large-scale musical structure used widely since the middle of the 18th century . While it is typically used in the first movement of multi-movement pieces, it is sometimes used in subsequent movements as well—particularly the final movement...

. The exposition typically establishes the music's tonic

Tonic (music)

In music, the tonic is the first scale degree of the diatonic scale and the tonal center or final resolution tone. The triad formed on the tonic note, the tonic chord, is thus the most significant chord...

 key

Key (music)

In music theory, the term key is used in many different and sometimes contradictory ways. A common use is to speak of music as being "in" a specific key, such as in the key of C major or in the key of F-sharp. Sometimes the terms "major" or "minor" are appended, as in the key of A minor or in the...

, and then modulates

Modulation (music)

In music, modulation is most commonly the act or process of changing from one key to another. This may or may not be accompanied by a change in key signature. Modulations articulate or create the structure or form of many pieces, as well as add interest...

 to, and ends in, the dominant

Dominant (music)

In music, the dominant is the fifth scale degree of the diatonic scale, called "dominant" because it is next in importance to the tonic,and a dominant chord is any chord built upon that pitch, using the notes of the same diatonic scale...

. If the exposition starts in a minor key, it typically modulates to the relative major key. There are many exceptions — for example the exposition of the first movement of Beethoven's Waldstein Sonata

Piano Sonata No. 21 (Beethoven)

The Piano Sonata No. 21 in C major, Op. 53, also known as the Waldstein, is considered to be one of Beethoven's greatest piano sonatas, as well as one of the three particularly notable sonatas of his middle period . The sonata was completed in the summer of 1804...

modulates from C major to the mediant E major. The exposition may include identifiable musical themes

Theme (music)

In music, a theme is the material, usually a recognizable melody, upon which part or all of a composition is based.-Characteristics:A theme may be perceivable as a complete musical expression in itself, separate from the work in which it is found . In contrast to an idea or motif, a theme is...

 (whether melodic

Melody

A melody , also tune, voice, or line, is a linear succession of musical tones which is perceived as a single entity...

, rhythm

Rhythm

Rhythm may be generally defined as a "movement marked by the regulated succession of strong and weak elements, or of opposite or different conditions." This general meaning of regular recurrence or pattern in time may be applied to a wide variety of cyclical natural phenomena having a periodicity or...

ic or chordal

Chord (music)

A chord in music is any harmonic set of two–three or more notes that is heard as if sounding simultaneously. These need not actually be played together: arpeggios and broken chords may for many practical and theoretical purposes be understood as chords...

 in character), and may develop them, but it is usually the key relationships and the sense of "arrival" at the dominant that is used by analysts in identifying the exposition. The exposition in classical symphonies is typically repeated, although there are many examples where the composer does not specify such a repeat.

If the movement starts with an introductory

Introduction (music)

In music, the introduction is a passage or section which opens a movement or a separate piece. In popular music this is often abbreviated as intro...

section, this introduction is not usually analysed as being part of the movement's exposition.

In many works of the Classical period and some of the Romantic era, the exposition is often bracketed by repeat signs, indicating that it is to be played twice. This is something which is not always done in concert from the 20th Century onwards.

Exposition in fugue form

A fugue usually has two main sections: the exposition and the body. In the exposition, each voice plays its own adaptation of the theme, in either a subject or an answer; they also provide countersubjects (counterpoints) to the following voices as they enter. The exposition usually ends on either a I or V chord, and is then followed by the body.