- Major and minor
Major and minor are frequently referred to in the titles of classical compositions, especially in reference to the key of a piece.
Intervals and chords
With regard to intervals, the words major and minor just mean large and small, so a major third is a wider interval, and a minor third a relatively narrow one. The intervals of the second, third, sixth, and seventh (and compound intervals based on them) may be major or minor.
The other uses of major and minor, in general, refer to musical structures containing major thirds or minor thirds. A major scale is one whose third degree is a major third above the tonic, while a minor scale has a minor third degree. A major chord or major triad, similarly, contains a major third above the root, whereas a minor chord or minor triad contains a minor third above the root. In Western music, a minor chord, in comparison, "sounds darker than a major chord".
The hallmark that distinguishes major keys from minor is whether the third scale degree is major or minor. "The crucial difference is that in the minor scale there is only a half step between the second and third tones as compared to the major scales where the difference between third and fourth note and between the seventh and the eighth note is half." This alteration in the third degree "greatly changes" the mood of the music, and "music based on minor scales tends to" be considered to "sound serious or melancholic".
The minor scale can be described in two different ways. One way is to consider it as the sixth mode of a major scale, while the other is to call it a variation of the major scale, with the third scale degrees always lowered (or altered) and the sixth and seventh degrees often lowered.
Minor keys are sometimes said to have a more interesting, possibly sadder sound than plain major scales. The minor mode, with its variable sixth and seventh degrees, offers nine notes, in C: C-D-E♭-F-G-A♭-A♮-B♭-B♮, over the major mode's seven, in C: C-D-E-F-G-A-B.
Relative major and minor
The relative minor of a major key has the same key signature and starts down a minor third (or equivalently up a major sixth); for example, the relative minor of G major is E minor. Similarly the relative major of a minor key starts up a minor third (or down a major sixth); for example, the relative major of F minor is A♭ major.
Relation to musical 'mode'
Contrastingly, changes of mode, which would involve the alteration of the third, and mode mixture, are often analyzed as minor or trivial changes unless structurally supported because the root and overall key and tonality remain unchanged. This is in contrast with, for instance, modulation or transposition. These latter operations are done by moving all intervals up or down a certain constant interval, and does change key, but does not change mode, which requires the alteration of intervals. The use of triads only available in the minor mode, such as the use of A♭-major in C major, is relatively decorative chromaticism, considered to add color and weaken sense of key without entirely destroying or losing it.
In western music theory, keys, chords, and scales are often described as having major or minor tonality, sometimes related to masculine and feminine genders, especially in languages with insistent syntactical gender assignments. By analogy, the major scales are given stereotypically masculine qualities (clear, open, extroverted), while the minor scales are given stereotypically feminine qualities (dark, soft, introverted). German uses the word Tongeschlecht ("Tone gender") for tonality, and the words Dur (from Latin durus, 'hard') for major and moll (from Latin mollis, 'soft') for minor.
Scales and chords
Major and minor chords may each be found in both the major and minor scales, constructed on different degrees of each. For example in the parallel keys on C on the first degree of the major scale a major chord (C-E-G) is constructed while on the first degree of the minor scale a minor chord (C-E♭-G) is constructed:
1 2 3 4 5 6 7 M m m M M m d
1 2 3 4 5 6 7 m d M m m M M
M m m M M m d m d M m m M M
There are two variations of the natural minor scale: harmonic and melodic. In a harmonic minor scale, the 7th note is raised a semitone, both ascending and descending. In a melodic minor scale, the 6th and 7th notes ascending are raised a semitone, and descending, the 6th and 7th notes are normal.
Intonation and tuning
Underlying perceived musical tuning of intervals is the frequency relationship expressed as a fraction. Simple fractions can sound more harmonious than complex fractions; for instance an octave is a simple 2:1 ratio and a fifth, also concordant is the relatively simple 3:2 ratio. The table below gives approximations of a scale to ratios that are rounded towards being as simple as possible.
C D E F G A B C 1 9/8 5/4 4/3 3/2 5/3 15/8 2
In just intonation, a minor chord is often (but not exclusively) tuned in the frequency ratio 10:12:15 ( play (help·info)). In 12-TET, or twelve-tone equal temperament (now the most common tuning system in the West), a minor chord has 3 semitones between the root and third, 4 between the third and fifth, and 7 between the root and fifth. It is represented by the integer notation 0,3,7. The 12-TET fifth (700 cents) is only two cents narrower than the just perfect fifth (3:2, 701.9 cents), but the 12-TET minor third (300 cents) is noticeably (about 16 cents) narrower than the just minor third (6:5, 315.6 cents). The 12-TET minor third (300 cents) more closely approximates the 19-limit (Limit (music)) minor third 16:19 Play (help·info) (297.5 cents, the nineteenth harmonic) with only 2 cents error. Ellis proposes that the conflict between mathematicians and physicists on one hand and practicing musicians on the other regarding the supposed inferiority of the minor chord and scale to the major may be explained due to physicists' comparison of just minor and major triads, in which case minor comes out the loser, versus the musicians' comparison of the equal tempered triads, in which case minor comes out the winner since the ET major third is 14 cents sharp from the just major third while the ET minor third closely approximates the consonant 19:16 minor third which many find pleasing.
In the German theory by or derived from Hugo Riemann, the minor mode is considered the inverse of the major mode, an upside down major scale based on (theoretical) undertones rather than (actual) overtones (harmonics) (See also: Utonality). The "root" of the minor triad is thus considered the top of the fifth, which, in the United States, is called "the" fifth. So in C minor, the tonic root is actually G, and the leading tone is A♭ (a halfstep), rather than, in major, the root being C and the leading tone B (a halfstep). Also, since all chords are analyzed as having a tonic, subdominant, or dominant function, with, for instance, in C, A-minor being considered the tonic parallel (US relative), Tp, the use of minor mode root chord progressions in major such as A♭-major—B♭-major—C-major is analyzed as sP—dP—T, the minor subdominant parallel, the minor dominant parallel, and the major tonic. (Gjerdingen, 1990)
- ^ a b c Kamien, Roger (2008). Music: An Appreciation, 6th Brief Edition, p.46. ISBN 978-0-07-340134-8.
- ^ Craig Wright (September 18, 2008)."Listening to Music: Lecture 5 Transcript", Open Yale Courses.
- ^ Alexander J. Ellis (translating Hermann Helmholtz): On the Sensations of Tone as a Physiological Basis for the Theory of Music, page 455. Dover Publications, Inc., New York, 1954.
- ^ Ellis (1954), p.298. In the 16th through 18th centuries, prior to 12-TET, the minor third in meantone temperament was 310 cents Play (help·info) and much rougher than the 300 cent ET minor third.
- "Proper fingering for piano scales" [major and minor], Music Life.
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