In music theory, the scale degree is the position of a particular note on a scale[1] relative to the tonic—the first and main note of the scale from which each octave is assumed to begin. Degrees are useful for indicating the size of intervals and chords and whether an interval is major or minor.
In the most general sense, the scale degree is the number given to each step of the scale, usually starting with 1 for tonic. Defining it like this implies that a tonic is specified. For instance, the 7-tone diatonic scale may become the major scale once the proper degree has been chosen as tonic (e.g. the C-major scale C–D–E–F–G–A–B, in which C is the tonic). If the scale has no tonic, the starting degree must be chosen arbitrarily. In set theory, for instance, the 12 degrees of the chromatic scale are usually numbered starting from C=0, the twelve pitch classes being numbered from 0 to 11.
In a more specific sense, scale degrees are given names that indicate their particular function within the scale (see table below). This implies a functional scale, as is the case in tonal music.
This example gives the names of the functions of the scale degrees in the seven-note diatonic scale. The names are the same for the major and minor scales, only the seventh degree changes name when flattened:[2]
The term scale step is sometimes used synonymously with scale degree, but it may alternatively refer to the distance between two successive and adjacent scale degrees (see steps and skips). The terms "whole step" and "half step" are commonly used as interval names (though "whole scale step" or "half scale step" are not used). The number of scale degrees and the distance between them together define the scale they are in.
In Schenkerian analysis, "scale degree" (or "scale step") translates Schenker's German Stufe, denoting "a chord having gained structural significance" (see Schenkerian analysis#Harmony).
Major and minor scales
editThe degrees of the traditional major and minor scales may be identified several ways:
- by their ordinal numbers, as the first, second, third, fourth, fifth, sixth, or seventh degrees of the scale, sometimes raised or lowered;
- by Arabic numerals (1, 2, 3, 4 ...), as in the Nashville Number System, sometimes with carets (
, 
, 
, 
...); - by Roman numerals (I, II, III, IV ...);[3]
- by the English name for their function: tonic, supertonic, mediant, subdominant, dominant, submediant, subtonic or leading note (leading tone in the United States), and tonic again. These names are derived from a scheme where the tonic note is the 'centre'. Then the supertonic and subtonic are, respectively, a second above and below the tonic; the mediant and submediant are a third above and below it; and the dominant and subdominant are a fifth above and below the tonic:[4]
The word subtonic is used when the interval between it and the tonic in the upper octave is a whole step; leading note is used when that interval is a half-step.Tonic Subtonic Supertonic Submediant Mediant Subdominant Dominant - by their name according to the movable do solfège system: do, re, mi, fa, so(l), la, and si (or ti).
Scale degree names
edit| Degree | Name | Corresponding mode (major key) | Corresponding mode (minor key) | Meaning | Note (in A major) | Note (in A minor) | Semitones |
|---|---|---|---|---|---|---|---|
| 1 | Tonic | Ionian | Aeolian | Tonal center, note of final resolution | A | A | 0 |
| 2 | Supertonic | Dorian | Locrian | One whole step above the tonic | B | B | 2 |
| 3 | Mediant | Phrygian | Ionian | Midway between tonic and dominant, (in minor key) tonic of relative major key | C♯ | C | 3-4 |
| 4 | Subdominant | Lydian | Dorian | Lower dominant, happens to have the same interval below tonic as dominant is above tonic | D | D | 5 |
| 5 | Dominant | Mixolydian | Phrygian | Second in importance to the tonic | E | E | 7 |
| 6 | Submediant | Aeolian | Lydian | Lower mediant, midway between tonic and subdominant, (in major key) tonic of relative minor key | F♯ | F | 8-9 |
| 7 | Subtonic (minor seventh) | Mixolydian | One whole step below tonic in natural minor scale. | G | 10 | ||
| Leading tone (major seventh) | Locrian | One half step below tonic. Melodically strong affinity for and leads to tonic | G♯ | 11 | |||
| 1 | Tonic (octave) | Ionian | Aeolian | Tonal center, note of final resolution | A | A | 12 |
See also
editReferences
edit- ^ Kolb, Tom (2005). Music Theory, p. 16. ISBN 0-634-06651-X.
- ^ Benward & Saker (2003). Music: In Theory and Practice, vol. I, p p.32–33. Seventh Edition. ISBN 978-0-07-294262-0. "Scale degree names: Each degree of the seven-tone diatonic scale has a name that relates to its function. The major scale and all three forms of the minor scale share these terms."
- ^ Jonas, Oswald (1982). Introduction to the Theory of Heinrich Schenker (1934: Das Wesen des musikalischen Kunstwerks: Eine Einführung in Die Lehre Heinrich Schenkers), p.22. Trans. John Rothgeb. ISBN 0-582-28227-6. Shown in uppercase Roman numerals.
- ^ Nicolas Meeùs, "Scale, polifonia, armonia", Enciclopedia della musica, J.-J. Nattiez ed. Torino, Einaudi, vol. II, Il sapere musicale, 2002. p. 84.