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mode (in music)

mode, in music. 1 A grouping or arrangement of notes in a scale with respect to a most important note (in the pretonal modes of Western music, this note is called the final or finalis), and the patterns of larger and smaller steps (in Western music, whole and half steps) which these notes form. In the Middle Ages eight modes were developed as a theoretical foundation for plainsong performance, notation, and composition. These modes, derived from church practice, and explained either in their own terms, or using terms drawn from ancient Greek music theory, were grouped in pairs, each pair containing an authentic mode and a plagal mode, which are distinguished by the difference in the position of their ranges with respect to the final. The range of each mode was an octave. The "authentic" mode has its final at the bottom (and top) of its octave, the "plagal" mode ranges from the fourth below the final to the fifth above it. Although Greek names came to be used for these modes—Dorian, Phrygian, Lydian, mixolydian, hypophrygian, etc.—there is no proof of direct relation to Greek theory. These eight modes were the basis for 11 centuries of musical composition. Freely treated, they have reappeared in the works of some 20th-century composers such as Vaughan Williams. In the late Middle Ages and during the Renaissance certain other modes were adopted, and in 1547 the Swiss theorist Glareanus described 12 as useful for composition. In the late 16th cent. and early 17th cent. the series was condensed in the major and minor modes in use today. The use of medieval modes by later composers is called modality in contrast to tonality. An extension of the term mode allows its application to the tonal systems of Hindu music, Arabian music, and Byzantine music.

See G. Reese, Music in the Middle Ages (1940); E. A. Wienandt, Choral Music of the Church (1965).



2 In the 13th cent., six characteristic rhythmical patterns of long and short notes in ternary meter. Greek names—e.g., trochaic and iambic—were applied to these rhythmic patterns at a fairly late date, but there is no evidence of derivation from the meters of Greek poetry. These rhythmic modes governed composition until they were finally dissolved in the 14th cent. by Philippe de Vitry in his treatise Ars nova (see musical notation).

3 In 20th-century music, the various forms of the tone row in twelve-tone composition (see serial music). The row, an arbitrary arrangement of the 12 chromatic tones of Western music, can be used in four different forms: the original row, the original row reversed (from the last note back to the first note), the original row inverted (upside down), and the inversion reversed. Each of these is a mode.

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mode

mode Classified scheme developed during the 4th to 16th centuries ad to systematize music. In the 4th century, from the scale worked out scientifically by Pythagoras, St Ambrose is thought to have devised four ‘authentic’ modes: the Dorian, Phrygian, Lydian, and Mixolydian. All the modes comprised eight notes within the compass of an octave. Pope Gregory (6th century) added four ‘plagal’ modes, which were essentially new forms of the Ambrosian modes (Hypodorian, Hypophrygian etc.). Glareanus (16th century) added the Aeolian and Ionian modes, the basis of the minor and major scales respectively.

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