Accelerating the Beat: Mastering the Musical Term for Speeding Up Tempo
In the precise language of music, specific terms dictate the pace and energy of a composition, with one term standing out for its directive to increase momentum. This article explores the concept of accelerating a musical piece, examining the standard terminology, historical application, and the technical execution required from performers. Understanding this directive is fundamental for musicians seeking to convey the intended drama and vitality of a score.
The Primary Directive: Accelerando and Its Kin
The most common and direct musical term for speeding up the tempo is accelerando, often abbreviated as accel. It is an Italian instruction placed within the sheet music that tells the performer to gradually increase the tempo. While other terms like ritenuto (hold back) or a tempo(return to the original speed) govern other rhythmic shifts, accelerando specifically addresses a forward momentum. It signals a build in energy, tension, or excitement, guiding the piece from a resting state toward a climax.
To understand its function, one must distinguish it from related concepts:
- Ritardando (rit.): The opposite action, meaning to gradually slow down.
- Tempo Rubato: A flexible approach where strict tempo is sacrificed for expressive timing, often involving slight speeding up and slowing down for emotional effect, rather than a directive to permanently increase the pace.
- Moderato, Allegro, Presto: These are absolute tempo markings (moderate, fast, very fast) rather than directives to change speed.
Accelerando bridges the gap between a composer's initial tempo and a desired, more intense sonic landscape.
Historical Application and Notable Examples
The use of accelerando became more prominent in the Romantic era of classical music (late 18th to early 20th century), as composers sought to expand the emotional palette of their compositions. They began to use dynamic tempo shifts to enhance drama and narrative. While the term itself has been in use since the 19th century, the practice of gradually increasing speed has roots in the expressive traditions of earlier centuries.
Consider the final movement of Ludwig van Beethoven's Symphony No. 7. While the overall tempo is marked Allegretto, a keen listener can perceive sections where the momentum subtly tightens, pushing the energy forward without a formal accelerando marking. In later Romantic works, the directive becomes more explicit. A composer like Richard Wagner would use such markings to propel his massive, complex structures toward overwhelming climaxes.
In modern film scoring, accelerando is a workhorse. Composer John Williams famously employs it to build suspense and propel action sequences. The iconic shark theme from "Jaws" is a masterclass in rhythmic acceleration and orchestral intensity, even if the word accelerando isn't written on the page. As film composer Michael Giacchino notes, "Tempo is a storytelling tool. Speeding up is the simplest way to tell the audience something bad is about to happen, or that the hero is finally engaged in the chase."
Technical Execution: How It's Done
Executing an accelerando is a nuanced skill that requires more than simply playing faster. It involves a careful recalibration of several musical elements to ensure the acceleration feels natural and purposeful, rather than rushed or chaotic.
- Rhythmic Nuance: The pulse, or underlying beat, must remain constant even as the notes around it become denser. Musicians focus on subdividing the beat internally to maintain a steady foundation while the overall tempo increases.
- Dynamic Swell: Accelerando is almost always paired with a crescendo(a gradual increase in volume). The two elements work in tandem—the sound grows louder while the tempo quickens, creating a powerful sense of rise.
- Articulation Clarity: As the speed increases, notes can become blurred. Performers must be meticulous about articulation—how notes are tongued or fretted—to ensure each individual sound remains distinct and intelligible.
- Metric Modulation: In more complex passages, a performer might subtly shift their internal feeling for the meter. For example, shifting from feeling the beat as groups of four to groups of three can make an accelerando feel smoother and more mathematically coherent.
A conductor leading an orchestra through a dramatic accelerando will use specific, expansive gestures to communicate the desired change, ensuring all sections move in unison. For a solo pianist, it involves a delicate coordination of the fingers and pedal to achieve the same effect.
The Creative Spectrum: From Notation to Improvisation
The application of accelerando exists on a spectrum from the meticulously notated to the freely improvised.
Notated Accelerando: In classical and jazz sheet music, the composer provides specific instructions. These can range from a simple accel. at the beginning of a passage to a detailed description of how much the tempo should increase over a defined number of bars. Sometimes, a new tempo marking (e.g., "Allegro") is placed at the end of the accelerando, formally establishing the new, faster speed.
Improvised Acceleration: In genres like jazz, blues, and rock, accelerating the tempo is a common live performance technique. A band might decide to "push the tempo" during a solo, creating a feedback loop of energy where the drummer plays harder and the guitarist plays faster, driving the song to a new level of intensity. This relies on deep listening and communication between the musicians. As jazz legend Miles Davis observed, "Time isn’t the main thing. It’s the only thing. But sometimes, you’ve got to bend it, stretch it, or drive right through it to get to the next level." An accelerando is one of the primary ways to do this.
Beyond the Music: The Psychology of Acceleration
The human brain is wired to respond to rhythmic patterns, and a change in tempo, particularly an increase, triggers a physiological response. A speeding-up tempo can elevate heart rate, stimulate the release of adrenaline, and create a feeling of excitement or urgency. This is why it is such a powerful tool in so many contexts.
- In Performance: Musicians use accelerando to channel their own energy and emotion into a piece, creating a unique moment that can vary from one performance to the next.
- In Composition: It provides a structural tool for shaping a piece, moving from introspection to exultation, or from a contemplative introduction to a driving finale.
- In Analysis: For the listener, identifying an accelerando offers a deeper understanding of the music’s architecture and emotional arc, revealing the composer’s intent to guide the listener on a journey.
Mastering the musical term for speeding up tempo is about more than just reading an instruction; it's about understanding the architecture of momentum in sound. It is a fundamental principle that allows music to breathe, evolve, and ultimately, to captivate.
