Phrygian mode

The octave species (scale) underlying the ancient-Greek Phrygian tonos (in its diatonic genus) corresponds to the medieval and modern Dorian mode. The terminology is based on the Elements by Aristoxenos (fl. c. 335 BCE), a disciple of Aristotle. The Phrygian tonos or harmonia is named after the ancient kingdom of Phrygia in Anatolia.

In Greek music theory, the harmonia given this name was based on a tonos, in turn based on a scale or octave species built from a tetrachord which, in its diatonic genus, consisted of a series of rising intervals of a whole tone, followed by a semitone, followed by a whole tone.

In the chromatic genus, this is a minor third followed by two semitones.

In the enharmonic genus, it is a major third and two quarter tones.

A diatonic-genus octave species built upon D is roughly equivalent to playing all the white notes on a piano keyboard from D to D:

This scale, combined with a set of characteristic melodic behaviours and associated ethe, constituted the harmonia which was given the ethnic name "Phrygian", after the "unbounded, ecstatic peoples of the wild, mountainous regions of the Anatolian highlands".^[1] This ethnic name was also confusingly applied by theorists such as Cleonides to one of thirteen chromatic transposition levels, regardless of the intervallic makeup of the scale.^[2]

Since the Renaissance, music theorists have called this same sequence (on a diatonic scale) the "Dorian" mode, due to a mistake interpreting Greek (it is different from the Greek mode called "Dorian").

The early Catholic Church developed a system of eight musical modes that medieval music scholars gave names drawn from the ones used to describe the ancient Greek harmoniai. The name "Phrygian" was applied to the third of these eight church modes, the authentic mode on E, described as the diatonic octave extending from E to the E an octave higher and divided at B, therefore beginning with a semitone-tone-tone-tone pentachord, followed by a semitone-tone-tone tetrachord:^[3]

The ambitus of this mode extended one tone lower, to D. The sixth degree, C, which is the tenor of the corresponding third psalm tone, was regarded by most theorists as the most important note after the final, though the fifteenth-century theorist Johannes Tinctoris implied that the fourth degree, A, could be so regarded instead.^[3]

Placing the two tetrachords together, and the single tone at bottom of the scale produces the Hypophrygian mode (below Phrygian):

In modern western music (from the 18th century onward), the Phrygian mode is related to the modern natural minor scale, also known as the Aeolian mode, but with the second scale degree lowered by a semitone, making it a minor second above the tonic, rather than a major second.

The following is the Phrygian mode starting on E, or E Phrygian, with corresponding tonal scale degrees illustrating how the modern major mode and natural minor mode can be altered to produce the Phrygian mode:

E Phrygian

Mode:	E	F	G	A	B	C	D	E
Major:	1	♭2	♭3	4	5	♭6	♭7	1
Minor:	1	♭2	3	4	5	6	7	1

Therefore, the Phrygian mode consists of: root, minor second, minor third, perfect fourth, perfect fifth, minor sixth, minor seventh, and octave. Alternatively, it can be written as the pattern

half, whole, whole, whole, half, whole, whole

In contemporary jazz, the Phrygian mode is used over chords and sonorities built on the mode, such as the sus4(♭9) chord (see Suspended chord), which is sometimes called a Phrygian suspended chord. For example, a soloist might play an E Phrygian over an Esus4(♭9) chord (E–A–B–D–F).

• Bhairavi, the equivalent scale (thaat) in Hindustani music
• Shoor, the main scale (dastgah) in Iranian music
• Hanumatodi, the equivalent scale (melakarta) in Carnatic music
• Kürdî, the equivalent scale (makam) in Turkish makam music
• Neapolitan chord
• Phrygian cadence