Sequence (music)In music, a sequence is the restatement of a motif or longer melodic (or harmonic) passage at a higher or lower pitch in the same voice. It is one of the most common and simple methods of elaborating a melody in eighteenth and nineteenth century classical music (Classical period and Romantic music). Characteristics of sequences:
It is possible for melody or harmony to form a sequence without the other participating.
There are many types of sequences, each with a unique pattern. Listed below are some examples.
In a melody, a real sequence is a sequence where the subsequent segments are exact transpositions of the first segment, while a tonal sequence is a sequence where the subsequent segments are diatonic transpositions of the first. The following passage from J.S. Bach demonstrates both kinds of sequence at work: Note: In the example image above, the annotation "the intervals in the second sequence are the same as in the first" is not entirely correct. The descending pitches in the first segment (G to A), have different intervals than in the second segment (C to D). The difference being in the last three pitches (C, Bb, A versus F, E, D). We have whole-step + half-step intervals in the first, and half-step + whole-step in the second.
A rhythmic sequence is the repetition of a rhythm with free use of pitches: A modified sequence is a sequence where the subsequent segments are decorated or embellished so as to not destroy the character of the original segment: A false sequence is a literal repetition of the beginning of a figure and stating the rest in sequence: A modulating sequence is a sequence that leads from one tonal center to the next, with each segment technically being in a different key in some sequences: The above passage starts in F major and modulates to B flat major and then, via the chord of G to C major. Sometimes sequential passages combine more than one of the above characteristics. In the third and fourth bars of the “Air” from J.S. Bach’s Orchestral Suite No. 3 in D major, the violin part forms a tonal sequence with the notes modified to fit the harmony, while the intervals in the bass line are unchanged, creating a real sequence. The whole passage also forms a modulating sequence, starting in D major and moving through E minor at the start of the fourth bar:
A sequence can be described according to its direction (ascending or descending in pitch) and its adherence to the diatonic scale—that is, the sequence is diatonic if the pitches remain within the scale, or chromatic (or non-diatonic) if pitches outside of the diatonic scale are used and especially if all pitches are shifted by exactly the same interval (i.e., they are transposed). The non-diatonic sequence tends to modulate to a new tonality or to cause temporarily tonicisation.
At least two instances of a sequential pattern—including the original statement—are required to identify a sequence, and the pattern should be based on several melody notes or at least two successive harmonies (chords). Although stereotypically associated with Baroque music, and especially the music of Antonio Vivaldi, this device is widespread throughout Western music history.
The device of sequence epitomises both the goal-directed and the hierarchical nature of common-practice tonality. It is particularly prevalent in passages involving extension or elaboration; indeed, because of its inherently directed nature, it was (and still is) often pulled from the shelf by the less imaginative tonal composer as the stock response to a need for transitional or [[musical development
Ritornellos and the amplification from melodies to Baroque lyrics are often built from sequences.
Descending fifthsDescending fifths sequences, also known as "circle of fifths" sequences, are the most commonly used types of sequences, singular extended in some works of Claudio Monteverdi and Heinrich Schütz. It usually consists of a series of chords whose bass or "root" notes follow a pattern of descending fifths (or ascending fourths).
For example, if a descending fifths sequence in C major starts with the note C, the next note will be F, a perfect fifth below the first note. The next few notes will be B, E, A, D and so on, following a pattern of descending fifths.
Ascending fifthsThe ascending fifths sequence, contrary to the descending fifths sequence, consists of a pattern of ascending fifths (or descending fourths). It is much less common than the descending fifths sequence.
Descending 5-6The descending 5-6 sequences, also known as descending third sequences, consist of a series of chords whose root notes descend by a third each sequential repetition.The sequence is almost never unadorned as shown above, but is generally filled in with intervening chords. The standard way of filling in this descending thirds pattern is to interpolate a first inversion chord in between each of these descents by thirds. The result is a bass line that moves down continuously stepwise, resulting in a figured bass of '5-6', and therefore, the standard descending 5-6 sequence.An important subtype of the descending 5-6 sequence is the root position variant, also known as the Pachelbel sequence, due to the use of this sequence in Pachelbel's Canon. The Pachelbel sequence changes the first inversion chords in the descending 5-6 sequence to root position chords, resulting in a bass pattern that moves down a fourth, and then up stepwise.
Ascending 5-6The ascending 5-6 sequence, like the ascending fifths sequence, adorns a stepwise ascent. It follows a root movement pattern of down a third (usually to a first inversion chord sharing the same bass note as the first note) followed by a root movement up a fourth. This is often accomplished through an alternation of root position and first inversion chords. The figured bass is the same as the descending 5-6 sequence, but the bass itself follows an ascending pattern rather than a descending pattern.The use of a similar 5-6 pattern outside of sequence is fairly common and is called 5-6 technique.
Less Common SequencesThe Sound of Music (also known as Rosalia) sequence features root movement up a fourth followed by root movement down a third. Both chords are in root position. The sequence is very similar to the ascending 5-6 sequence since it also allows for an overall stepwise ascent between parallel triads, much like the ascending 5-6.
The “Sisyphus Sequence” (term coined by John H. Benson, professor of Music Theory at Lawrence University), is an ascending 3-4 sequence. It sounds like a ball being rolled up a hill, as described in the story of Sisyphus in Greek Mythology.