Concept

Subject (music)

In music, a subject is the material, usually a recognizable melody, upon which part or all of a composition is based. In forms other than the fugue, this may be known as the theme. A subject 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 subject is usually a complete phrase or period. The Encyclopédie Fasquelle defines a theme (subject) as "[a]ny element, motif, or small musical piece that has given rise to some variation becomes thereby a theme". Thematic changes and processes are often structurally important, and theorists such as Rudolph Reti have created analysis from a purely thematic perspective. Fred Lerdahl describes thematic relations as "associational" and thus outside his cognitive-based generative theory's scope of analysis. Music based on a single theme is called 'monothematic', while music based on several themes is called 'polythematic'. Most fugues are monothematic and most pieces in sonata form are polythematic. In the exposition of a fugue, the principal theme (usually called the 'subject') is announced successively in each voice – sometimes in a transposed form. In some compositions, a principal subject is announced and then a second melody, sometimes called a 'countersubject' or 'secondary theme', may occur. When one of the sections in the exposition of a sonata-form movement consists of several themes or other material, defined by function and (usually) their tonality, rather than by melodic characteristics alone, the term 'theme group' (or 'subject group') is sometimes used. Music without subjects/themes, or without recognizable, repeating, and developing subjects/themes, is called 'athematic'. Examples include the pre-twelve-tone or early atonal works of Arnold Schoenberg, Anton Webern, Alban Berg, and Alois Hába. Schoenberg once said that, "intoxicated by the enthusiasm of having freed music from the shackles of tonality, I had thought to find further liberty of expression. In fact, I ...

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Cell (music)
The 1957 Encyclopédie Larousse defines a cell in music as a "small rhythmic and melodic design that can be isolated, or can make up one part of a thematic context". The cell may be distinguished from the figure or motif: the 1958 Encyclopédie Fasquelle defines a cell as "the smallest indivisible unit", unlike the motif, which may be divisible into more than one cell. "A cell can be developed, independent of its context, as a melodic fragment, it can be used as a developmental motif.
Part (music)
A part in music refers to a component of a musical composition. Because there are multiple ways to separate these components, there are several contradictory senses in which the word "part" is used: the musical instructions for any individual instrument or voice (often given as a handwritten, printed, or digitized document) of sheet music (as opposed to the full score which shows all parts of the ensemble in the same document). A musician's part usually does not contain instructions for the other players in the ensemble, only instructions for that individual.
Motif (music)
In music, a motif IPA: (/moʊˈtiːf/) (also motive) is a short musical idea, a salient recurring figure, musical fragment or succession of notes that has some special importance in or is characteristic of a composition. The motif is the smallest structural unit possessing thematic identity. The Encyclopédie de la Pléiade regards it as a "melodic, rhythmic, or harmonic cell", whereas the 1958 Encyclopédie Fasquelle maintains that it may contain one or more cells, though it remains the smallest analyzable element or phrase within a subject.
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