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Like F-sharp major, G-flat major is rarely chosen as the main key for orchestral works. It is more often used as a main key for piano works, such as the impromptus of Chopin and Schubert . It is the predominant key of Maurice Ravel 's Introduction and Allegro for harp, flute, clarinet and string quartet , and is also used in the second movement ...
For orchestration of piano music, some theorists recommend transposing the music to F major or G major. If F-sharp major must be used, one should take care that B♭ wind instruments be notated in A-flat major, rather than G-sharp major (or E♮/B♮ instruments used instead, giving a transposed key of D major/G major).
If the original key was C-sharp, such a modulation would lead to the theoretical key of G-sharp major (with eight sharps) requiring an F in place of the F ♯. This section could be written using the enharmonically equivalent key signature of A-flat major instead.
When a musical key or key signature is referred to in a language other than English, that language may use the usual notation used in English (namely the letters A to G, along with translations of the words sharp, flat, major and minor in that language): languages which use the English system include Irish, Welsh, Hindi, Japanese (based on katakana in iroha order), Korean (based on hangul in ...
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.
Although the enharmonic key of A-flat major is preferred because A-flat major has only four flats as opposed to G-sharp major's eight sharps (including the F), G-sharp major appears as a secondary key area in several works in sharp keys, most notably in the Prelude and Fugue in C-sharp major from Johann Sebastian Bach's The Well-Tempered Clavier, Book 1.
F-sharp minor is sometimes used as the parallel minor of G-flat major, especially since G-flat major's real parallel minor, G-flat minor, would have nine flats including two double-flats. For example, in the middle section of his seventh Humoresque in G-flat major , Antonín Dvořák switches from G-flat major to F-sharp minor for the middle ...
In rare cases, the sharp keys may be extended further, G ♯ → D ♯ → A ♯ → E ♯ → B ♯ → F → C, requiring double sharps in the key signature: F, C, G, D, A, E, B. These are called theoretical key signatures. This principle applies similarly to the flat keys.