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Concept
Augmentation (music)
Summary
In Western music and music theory, augmentation (from Late Latin augmentare, to increase) is the lengthening of a note or the widening of an interval.
Augmentation is a compositional device where a melody, theme or motif is presented in longer note-values than were previously used. Augmentation is also the term for the proportional lengthening of the value of individual note-shapes in older notation by coloration, by use of a sign of proportion, or by a notational symbol such as the modern dot. A major or perfect interval that is widened by a chromatic semitone is an augmented interval, and the process may be called augmentation.
A melody or series of notes is augmented if the lengths of the notes are prolonged; augmentation is thus the opposite of diminution, where note values are shortened. A melody originally consisting of four quavers (eighth notes) for example, is augmented if it later appears with four crotchets (quarter notes) instead. This technique is often used in contrapuntal music, as in the "canon by augmentation" ("per augmentationem"), in which the notes in the following voice or voices are longer than those in the leading voice, usually twice the original length. The music of Johann Sebastian Bach provides examples of this application:
Other ratios of augmentation, such as 1:3 (tripled note values) and 1:4 (quadrupled note values), are also possible. A motif is also augmented through expanding its duration.
Augmentation may also be found in later, non-contrapuntal pieces, such as the Pastoral Symphony (Symphony No. 6) of Beethoven, where the melodic figure first heard in the second violins at the start of the "Storm" movement ("Die Sturm"):
is heard again in an augmented and transposed version in the same movement’s closing ten bars:
Examples of augmentation may be found in the development sections of sonata form movements, particularly in the symphonies of Brahms and Bruckner and in the protean leitmotifs in Wagner’s operas, which undergo all kinds of transformation as the characters change and develop through the unfolding drama.
Official source
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