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Musical Form

Module by: Anthony Brandt. E-mail the author

Summary: Musical form is the wider perspective of a piece of music. It describes the layout of a composition as divided into sections, akin to the layout of a city divided into neighborhoods.

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Grasping the Whole Composition

Driving through a city for the first time can be very disorienting. Building after building catches your eye. You circle past a monument, then a fountain. Restaurants, hotels and shops fly past. Trying to absorb and remember all of these landmarks quickly becomes tiring. Was the town square before or after the park? Did you pasa a museum? If you don't speak the language, an extra anxiety sets in. You try to decipher the street signs, negotiate the traffic. By the time you arrive at the hotel, you fall on your bed, exhausted.

Similarly, it is easy to get lost in the moment-to-moment progress of a piece of music: There are often too many details to remember, too many implications to contemplate. If the work is particularly dynamic, you may become overwhelmed with its rapid progress. If the musical language is unfamiliar, even one poorly understood sound may throw you into confusion.

In your visit to a new city, it is wiser to begin with an overview of the neighborhoods. First, you notice that you are traversing the old town, where the buildings are closely packed together and the streets narrow and winding. Then, you pass into the modern section, with sleek high-rises, set apart along straight thoroughfares. You don't need to speak the language; nor is there the pressure to remember facades or street-names. Later, you may revisit the old town on foot, discovering quiet alleys and ancient monuments. But, for now, you content yourself with a general sense of the city's layout: How large is the old town compared to the new? How much variety of architecture characterizes each neighborhood? This more patient, disciplined approach helps to orient your future explorations. It will be harder to get lost or overwhelmed when you have a commanding sense of the city's layout.

Similarly, the path to informed listening begins with a grasp of the whole composition. There are tremendous advantages to beginning with a commanding perspective: While details tend to pass by very quickly; the overall trajectory of the music unfolds more gradually, giving you more time to consider it. The significance of an individual gesture is often clearer when related to the work's overall destiny. And, while the immediate sounds are bristling with personality and may be difficult to grasp, the larger structure is often easier to hear accurately.

Thus, we will approach listening to a piece of music by moving from the whole into the details: We will begin by developing an awareness of the composition's form and destiny, then gradually sink into the details with a stronger sense of their relevance.

Musical form is the wider perspective of a piece of music. It describes the layout of a composition as divided into sections, akin to the layout of a city divided into neighborhoods.

Musical works may be classified into two formal types: A and A/B. Compositions exist in a boundless variety of styles, instrumentation, length and content--all the factors that make them singular and personal. Yet, underlying this individuality, any musical work can be interpreted as either an A or A/B-form.

An A-form emphasizes continuity and prolongation. It flows, unbroken, from beginning to end. In a unified neighborhood, wander down any street and it will look very similar to any other. Similarly, in an A-form, the music has a recognizable consistency.

The other basic type is the A/B form. Whereas A-forms emphasize continuity, A/B- forms emphasize contrast and diversity. A/B-forms are clearly broken up into sections, which differ in aurally immediate ways. The sections are often punctuated by silences or resonant pauses, making them more clearly set off from one another. Here, you travel among neighborhoods travels that are noticeably different from one another: The first might be a residential neighborhood, with tree-lined streets and quiet cul-de-sacs. The next is an industrial neighborhood, with warehouses and smoke-stacks.

The prime articulants of form are rhythm and texture. If the rhythm and texture remain constant, you will tend to perceive an A-form. If there is a marked change in rhythm or texture, you will tend to perceive a point of contrast--a boundary, from which you pass into a new neighborhood. This will indicate an A/B-form.

Listen to the following two examples. What is the form of each?

Problem 1

What is the form?


Problem 2


Problem 3

Now consider a work in a less familiar style. What is its form?


Labeling the Forms

It is conventional to give alphabetic labels to the sections of a composition: A, B, C, etc. If a section returns, its letter is repeated: for instance, "A-B-A" is a familiar layout in classical music.

As the unbroken form, A-forms come only in a single variety. They may be long or short, but they are always "A".

As the contrast form, A/B-forms come in a boundless array of possibilities. There may be recurring sections, unique ones, or any combination of both. For instance, a Rondo--a popular form in Classical music--consists of an alternation of a recurring section and others that occur once each. It would be labelled A-B-A-C-A-D-A, etc. Many twentieth-century composers became fascinated with arch-forms: A-B-C-B-A.

An on-going form, with no recurrence whatsoever, is also possible: A-B-C-D-E... Any sequence of recurring and unique sections may occur.

Example 1

How would you describe the following form? First, click when you hear a new section. Then, use the pull-down menu to label each section.

This movement is labeled as an A-B-A form. It opens with frantic, somber, rhythmically persistent music. The contrasting section has a lighter, more carefree feeling and a new prevailing rhythm. Finally, the opening section returns exactly.


Understanding the layout of the city is crucial for exploring it: once you understand its topography, you know how to find its landmarks, where the places for recreation or business may lie. Similarly, determining the form of a piece will tell you a lot about it. If it is an A-form, your next focus will be on the work's main ideas, and how they are extended across the entire composition. If it is an A/B-form, your next investigations will be into the specific layout of sections and the nature of the contrasts.

Before we continue with more detailed analyses of A- and A/B-forms, we have other large-scale features to discuss. Thus far, we have considered spatial metaphors for music. However, a musical performance is not a static structure: It progresses through time. Therefore, a complete reckoning of musical form requires a dynamic component--one that is time-dependent. You are free to enter a city from the north or south and move about at will. However, there is only one way to enter a musical performance--from the beginning--and one way to exit--the end. It is music's time-directed nature that enables it to be dramatic.

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