Musical form facts for kids

In music, form refers to the structure of a musical composition or performance. Compositions that do not follow a fixed structure and rely more on improvisation are considered free-form. A fantasia is an example of this. Composer Debussy in 1907 wrote that, "I am more and more convinced that music is not, in essence, a thing that can be cast into a traditional and fixed form. It is made up of colors and rhythms."

Labeling

To aid in the process of describing form, musicians have developed a simple system of labeling musical units with letters. In his textbook Listening to Music, professor Craig Wright writes:

The first statement of a musical idea is designated A. Subsequent contrasting sections are labeled B, C, D, and so on. If the first or any other musical unit returns in varied form, then that variation is indicated by a superscript number—A¹ and B², for example. Subdivisions of each large musical unit are shown by lowercase letters (a, b, and so on).

Some writers also use a prime label (such as B′, pronounced "B prime", or B″, pronounced "B double prime") to denote sections that are closely related, but vary slightly.

Levels of organization

The founding level of musical form can be divided into two parts:

• The arrangement of the pulse into unaccented and accented beats, the cells of a measure that, when harmonized, may give rise to a motif or figure.
• The further organization of such a measure, by repetition and variation, into a true musical phrase having a definite rhythm and duration that may be implied in melody and harmony, defined, for example, by a long final note and a breathing space. This "phrase" may be regarded as the fundamental unit of musical form: it may be broken down into measures of two or three beats, but its distinctive nature will then be lost. Even at this level, the importance of the principles of repetition and contrast, weak and strong, climax and repose, can be seen. Thus, form may be understood on three levels of organization. For the purpose of this exposition, these levels can be roughly designated as passage, piece, and cycle.

Passage

The smallest level of construction concerns the way musical phrases are organized into musical sentences and "paragraphs" such as the verse of a song. This may be compared to, and is often decided by, the verse form or meter of the words or the steps of a dance.

For example, the twelve bar blues is a specific verse form, while common meter is found in many hymns and ballads and, again, the Elizabethan galliard, like many dances, requires a certain rhythm, pace and length of melody to fit its repeating pattern of steps. Simpler styles of music may be more or less wholly defined at this level of form, which therefore does not differ greatly from the loose sense first mentioned and which may carry with it rhythmic, harmonic, timbral, occasional and melodic conventions.

Piece (or movement)

The next level concerns the entire structure of any single self-contained musical piece or movement. If the hymn, ballad, blues or dance alluded to above simply repeats the same musical material indefinitely then the piece is said to be in strophic form overall. If it repeats with distinct, sustained changes each time, for instance in setting, ornamentation or instrumentation, then the piece is a theme and variations. If two distinctly different themes are alternated indefinitely, as in a song alternating verse and chorus or in the alternating slow and fast sections of the Hungarian czardas, then this gives rise to a simple binary form. If the theme is played (perhaps twice), then a new theme is introduced, the piece then closing with a return to the first theme, we have a simple ternary form.

Great arguments and misunderstanding can be generated by such terms as 'ternary' and 'binary', as a complex piece may have elements of both at different organizational levels. A minuet, like any Baroque dance, generally had a simple binary structure (AABB), however, this was frequently extended by the introduction of another minuet arranged for solo instruments (called the trio), after which the first was repeated again and the piece ended—this is a ternary form—ABA: the piece is binary on the lower compositional level but ternary on the higher. Organisational levels are not clearly and universally defined in western musicology, while words like "section" and "passage" are used at different levels by different scholars whose definitions, as Schlanker points out, cannot keep pace with the myriad innovations and variations devised by musicians.

Cycle

The grandest level of organization may be referred to as "cyclical form". It concerns the arrangement of several self-contained pieces into a large-scale composition. For example, a set of songs with a related theme may be presented as a song-cycle, whereas a set of Baroque dances were presented as a suite. The opera and ballet may organize song and dance into even larger forms. The symphony, generally considered to be one piece, nevertheless divides into multiple movements (which can usually work as a self-contained piece if played alone). This level of musical form, though it again applies and gives rise to different genres, takes more account of the methods of musical organisation used. For example: a symphony, a concerto and a sonata differ in scale and aim, yet generally resemble one another in the manner of their organization. The individual pieces which make up the larger form may be called movements.

See also

In Spanish: Forma musical para niños

• Developing variation
• List of musical genres by era
• Musical analysis
• Program music