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Starting from a major chord, for example G major (G–B–D), there are twelve potential goals using a common-tone modulation: G minor, G ♯ minor, B ♭ major, B major, B minor, C major, C minor, D minor, D major, E ♭ major, E major, E minor. [14] Thus common-tone modulations are convenient for modulation by diatonic or chromatic third.
In the key of C major, these would be: D minor, E minor, F major, G major, A minor, and C minor. Despite being three sharps or flats away from the original key in the circle of fifths, parallel keys are also considered as closely related keys as the tonal center is the same, and this makes this key have an affinity with the original key.
A pair of major and minor scales sharing the same key signature are said to be in a relative relationship. [1] [2] The relative minor of a particular major key, or the relative major of a minor key, is the key which has the same key signature but a different tonic. (This is as opposed to parallel minor or major, which shares the same tonic.)
The key may be in the major or minor mode, though musicians assume major when this is not specified; for example "This piece is in C" implies that the key of the piece is C major. Popular songs and classical music from the common practice period are usually in one key. Longer pieces in the classical repertoire may have sections in contrasting keys.
For example, relative to the key of C major, the key of A minor is the submediant. In a major key, the submediant key is the relative minor. Modulation (change of key) to the submediant is relatively rare, compared with modulation to the dominant in a major key or modulation to the mediant (relative major) in a minor key.
B-flat minor is traditionally a 'dark' key. [1] The old valveless horn was barely capable of playing in B-flat minor: the only example found in 18th-century music is a modulation that occurs in the first minuet of Franz Krommer's Concertino in D major, Op. 80. [2]
A major interval is one semitone larger than a minor interval. The words perfect, diminished, and augmented are also used to describe the quality of an interval.Only the intervals of a second, third, sixth, and seventh (and the compound intervals based on them) may be major or minor (or, rarely, diminished or augmented).
Pieces in a minor key will generally modulate to the relative major key, (the key of the third scale degree above the minor tonic), or to the dominant minor. A piece in minor may also stay in the original key at the end of the first section, closing with an imperfect cadence.