Anacrusis


In poetic and musical meter, and by analogy in publishing, an anacrusis is a brief introduction. In music, it is also known as a pickup beat, or fractional pick-up, i.e. a note or sequence of notes, a motif, which precedes the first downbeat in a bar in a musical phrase.
It is a set of syllables or notes, or a single syllable or note, which precedes what is considered the first foot of a poetic line in poetry and the first beat in music that is not its own phrase, section, or line and is not considered part of the line, phrase, or section which came before, if any.

Poetry

In poetry, a set of extrametrical syllables at the beginning of a verse is said to stand in anacrusis. "An extrametrical prelude to the verse," or, "extrametrical unstressed syllables preceding the initial lift." The technique is seen in Old English poetry, and in lines of iambic pentameter, the technique applies a variation on the typical pentameter line causing it to appear at first glance as trochaic. Below, the anacrusis in the fourth line of William Blake's poem "The Tyger" is in italics:
The poem is in trochaic tetrameter, in which the first syllable of each line is expected to be stressed, but the fourth line begins with the additional unstressed syllable "Could".

Music

In music, an anacrusis is a note or sequence of notes, a motif, which precedes the first downbeat in a bar in a musical phrase. "The span from the beginning of a group to the strongest beat in the group." Anacrusis, especially reoccurring anacrusis, "is a common means of weighting the first beat," and thus strengthening or articulating the meter.
The term is borrowed from the terminology of poetry. Anacruses may involve fine details such as rhythm and phrasing or may involve wider features such as musical form.
File:Boccherini Minuet anacrusis.png|thumb|Anacrusis, in red, beginning Boccherini's Minuet|411x411px
The anacrusis is a perceived grouping which is context generated in the individual phrasing of a concrete composition. The grouping of one or more antecedent tone events to a perceived phrase gestalt may be rhythmically evoked by their temporal proximity to the phrase's first downbeat.
Although the anacrusis is integrated in a musical phrase gestalt, it is not located in the perceived 'body' of the phrase but before the phrase. In this respect – in a sequence of phrases – the anacrusis also may be perceived 'between' two phrases, neither being perceived as part of the ending of a former one, nor being located in the following one.
Outside of that the term of the anacrusis is most commonly used where it applies everywhere else 'within' the 'body' of the phrase between the 'head' and the 'foot' where, by what ever musical means, a grouping is perceived from an upbeat to a downbeat.
File:Staggered thirds in C.png|thumb|Shuffle pattern, begins on the upbeat and ends with a measure thus shortened|378x378px
Since an anacrusis "is an incomplete measure that allows the composition to start on a beat other than one," if an anacrusis is present, the first bar after the anacrusis is assigned bar number 1, and Western standards for musical notation often include the recommendation that when a piece of music begins with an anacrusis, the notation should omit a corresponding number of beats from the final bar of the piece, or the final bar before a repeat sign, in order to keep the length of the entire piece at a whole number of bars. This final partial measure is the complement. However, an anacrusis may last an entire bar.

Examples

  • In the song "Happy Birthday to You", Happy is the anacrusis and the accent is on the first syllable of Birthday.
  • In "The Star-Spangled Banner", the word O! in the first line is an anacrusis in the music:
  • At the beginning of the Beatles' "Yellow Submarine", "In the" is the anacrusis, while "town" falls on the downbeat.

    Other fields

In academic publishing, the term is sometimes used in an article to mark an introductory idea standing between the abstract and the introduction proper.