Diminution

File:Trattado p.5.JPG

Extract from Diego Ortiz's El Primo Libro ... Nel qual si tratta delle Glose depicting rhythm and generic intervals. Observe the diminution (i.e. division) process suggested by the composer, in reference to the rhythmic figures in the upper and lower musical parts.

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In Western music and music theory, diminution (from Medieval Latin diminutio, alteration of Latin deminutio, decrease) has four distinct meanings. Diminution may be a form of embellishment in which a long note is divided into a series of shorter, usually melodic, values (also called "coloration"; Ger. Kolorieren). Diminution may also be the compositional device where a melody, theme or motif is presented in shorter note-values than were previously used. Diminution is also the term for the proportional shortening of the value of individual note-shapes in mensural notation, either by coloration or by a sign of proportion. A minor or perfect interval that is narrowed by a chromatic semitone is a diminished interval, and the process may be referred to as diminution (this, too, was sometimes referred to as "coloration").

Diminution as embellishment

Diminution is a form of embellishment or melodic variation in which a long note or a series of long notes is divided into shorter, usually melodic, values, as in the similar practices of breaking or division in England, passaggio in Italy, double in France and glosas or diferencias in Spain.Template:R It is thoroughly documented in written sources of the sixteenth, seventeenth and early eighteenth centuries, and enjoyed a remarkable flowering in Venice from about 1580–1620. It is an integral aspect of modern performance practice; Donington describes the consequences of failing to add "necessary figuration" as "disastrous".Template:R

Italian literature of the sixteenth and early seventeenth century

• Silvestro Ganassi Opera Intitulata Fontegara (Venice, 1535)
• Diego Ortiz, Nel qual si tratta delle Glose (1553)
• Giovanni Maffei, Delle lettere del Sr. Gio. Camillo Maffei da Solofra (1562)
• Girolamo Dalla Casa, Il vero modo di diminuir (1584)
• Giovanni Bassano, Ricercate, Passaggi et Cadentie (1585)
• Giovanni Luca Conforti, Breve et facile maniera d'essercitarsi a far passaggi (1593)
• Riccardo Rogniono, Passaggi per potersi essercitare nel diminuire terminatamente (1594)
• Giovanni Battista Bovicelli, Regole, passaggi di musica (1594)
• Aurelio Virgiliano, Il Dolcimelo (ms, c. 1600; first publication 1979)
• Francesco Rognoni Taeggio, Selve de varii passaggi (1620 )
• Giovanni Battista Spadi, Libro de passaggi ascendenti et descendenti (1624)

Spanish literature

• Diego Ortiz, Trattado de Glosas (1553)

English literature

• Christopher Simpson, The Division-Violist (1659)
• The Division-Violin (Playford, 1684)
• The Division Flute (Walsh, c. 1706)

German literature

• Adrianus Petit Coclico, Compendium Musices (Nuremberg, 1552)
• Michael Praetorius, Syntagma Musicum, book 3 (1618)
• Johann Andreas Herbst, Musica practica (1642)

Dutch literature

• Jacob van Eyck, Der Fluyten Lust-hof (Amsterdam, 1646) is a huge collection of diminutions.Template:R

For Heinrich Schenker, "all foreground is diminution".<ref>Template:Cite book</ref> "All diminution must be secured firmly to the total work by means which are precisely demonstrable and organically verified by the inner necessities of the voice-leading".<ref>Template:Cite book</ref> This conception has been essential to Schenker's theory from some of his earliest writings.<ref>Template:Cite book</ref> In Schenkerian analysis a diminution is an elaboration by which an event formed of notes of longer value is expressed in notes of smaller value. See nonchord tone.

Diminution in composition

A melody or series of notes is diminished if the lengths of the notes are shortened; diminution is thus the opposite of augmentation, where the notes are lengthened. A melody originally consisting of four crotchets (quarter-notes) for example, is diminished if it later appears with four quavers (eighth-notes) instead. In the following theme from Beethoven's Leonora no. 3 Overture, the melodic ideas in bars 3 and 5 recur at twice the speed in bars 7–8:

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Beethoven, Leonora no. 3 overture, bars 69–76

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Leonora no 3

This technique is often used in contrapuntal music, as in the "canon by diminution" ("per diminutionem"), in which the notes in the following voice or voices are shorter than those in the leading voice, usually half the length.<ref name="Jeppesen">Jeppesen, Knud. Counterpoint: The Polyphonic Vocal Style of the Sixteenth Century. trans. Glen Haydon. New York: Dover Publications. 1992. p. 235 Template:Cite book</ref>

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Contrapunctus VII from Bach's Art of Fugue

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Contrapuntus VII from Bach's Art of Fugue. Observe the lower voice of the canon in halved (i.e. diminished) note values.

In jazz, Thelonious Monk's composition "Brilliant Corners" consists of a theme that is repeated at twice the speed, an effect known as "double time."

Diminution of note values

In mensural notation, diminution of the duration of note shapes is the most common function of coloration. Diminution is most often by one-third of the note-value, so that three colored notes fit into the time of two uncolored notes of the same shape; it is thus often found in notation of triplet or hemiola figures.Template:R

Diminution may also be achieved by a sign of proportion. Thus a sign such as Template:Music is in proportional notation not a modern time signature, but a proportional signature indicating diminutio sesquialtera, that is, that after the sign each three notes of the basic note value integer valor occupy the time of two such notes elsewhere in the piece, either previously in the same voice, or simultaneously in another voice.<ref name=bowers/>

Diminution of intervals

A diminished interval is an interval obtained from a minor interval or perfect interval by narrowing it by a chromatic semitone, meaning that the interval is narrowed by a semitone, but the staff positions are not changed (only an accidental is changed); the process may occasionally be referred to as diminution For example, a diminished sixth is a chromatic semitone narrower than the minor sixth: starting with the interval from B to G, which is a minor sixth, eight semitones wide, the interval from B to GTemplate:Music is a diminished sixth, spanning seven semitones, but the same staff lines. By contrast, the interval from B to FTemplate:Music is not a diminished sixth (it is a perfect fifth): even though it is seven semitones wide, it spans five staff positions, and is thus a fifth, not a sixth; it is a diatonic semitone narrower than a minor sixth. The standard abbreviations for diminished intervals are dX, such that a diminished third = d3.<ref name="B&S"/> The diminished fifth (d5) is the only diminished interval that appears in diatonic scales (in DTemplate:Music major it occurs between C and GTemplate:Music).

Diminished intervals on C

Diminished second	Diminished third	Diminished fourth	Diminished fifth	Diminished sixth	Diminished seventh	Diminished octave
File:Diminished second on C.png	File:Diminished third on C.png	File:Diminished fourth on C.png	File:Diminished fifth on C.png	File:Diminished sixth on C.png	File:Diminished seventh on C.png	File:Diminished octave on C.png
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Diminished chords

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A diminished triad consists of two superposed minor thirds, and thus contains a diminished fifth. In classical repertoire the usual symbol Template:Music resembles the degree symbol, as in viiTemplate:Music. In lead sheets and popular music books it is usually written Cdim or CTemplate:Music.

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A diminished seventh chord consists of three superposed minor thirds, and thus has all successive notes a minor third apart; it contains two diminished fifths. In jazz theory, a diminished seventh chord has four available tensions, each a major ninth above the chord tones, and thus forming a diminished seventh chord a whole tone (or major ninth) above the root chord. Because any chord tone of the diminished seventh can be heard as the root, the tensions are not numbered as ninth, eleventh and so on. The usual notation is Cdim⁷ or CTemplate:Music⁷, but some lead sheets or popular music books may omit the 7.

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A diminished triad with a minor seventh is a half-diminished chord, usually notated either Cm^{7(Template:Music5)} or C^ø7. A diminished triad played over a root a major third away creates a Dominant 7th chord, notated C⁷, with a C Major triad on the bottom, and an E° from the chord third of C (C E G BTemplate:Music). A minor third below would give a fully diminished 7th chord which is made entirely of minor thirds that evenly divide an octave. This even division of the octave leaves us with only three unique diminished 7th chords: C E^{Template:Music} G^{Template:Music} B^{Template:Music}, C^{Template:Music} E G B^{Template:Music}, and D F A^{Template:Music} C^{Template:Music}, as all other diminished 7th chords are inversions of one of those three.

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Diminished chords with sheet music and tab.

Diminished scales

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Several scales may be referred to as diminished. One of the more common is the Octatonic scale constructed from CTemplate:Music⁷ and its tensions (transposed into the same octave), which has alternating tone and semitone intervals.

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See also

• Augmentation (music)