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In music theory, a major scale and a minor scale that have the same starting note are called parallel keys and are said to be in a parallel relationship. [ 1 ] [ 2 ] For example, G major and G minor have the same tonic (G) but have different modes , so G minor is the parallel minor of G major.
Parallel keys are the most widely used. They have a square or rectangular cross-section. Square keys are used for smaller shafts and rectangular faced keys are used for shaft diameters over 6.5 in (170 mm) or when the wall thickness of the mating hub is an issue. Set screws often accompany parallel keys to lock the mating parts into place. [3]
The usual parallel chord in a major key is a minor third below the root and the counter parallel is a major third above. In a minor key the intervals are reversed: the tonic parallel (e.g. Eb in Cm) is a minor third above, and the counter parallel (e.g. Ab in Cm) is a major third below.
A-flat major was the flattest major key to be used as the home key for the keyboard and piano sonatas of Domenico Scarlatti, Joseph Haydn and Ludwig van Beethoven, with each of them using the key for two sonatas: Scarlatti's K. 127 and K. 130, Haydn's Hob XVI 43 and 46, and Beethoven's Op. 26 and Op. 110, while Franz Schubert used it for one ...
Polish composer Frédéric Chopin wrote two études in the key of G-flat major: Étude Op. 10, No. 5 "Black Key" and Étude Op. 25, No. 9 "Butterfly" as well as a waltz in Op. 70. French composer Claude Debussy used this key for one of his most popular compositions, La fille aux cheveux de lin , the eighth prélude from his Préludes, Book I ...
The key is also appropriate for guitar music, with drop D tuning making two D's available as open strings. [1] For some beginning wind instrument students, however, D major is not a very suitable key, since it transposes to E major on B ♭ wind instruments, and beginning methods generally tend to avoid keys with more than three sharps.
"E-flat was the key Haydn chose most often for [string] quartets, ten times in all, and in every other case he wrote the slow movement in the dominant, B-flat major." [ 2 ] Or "when composing church music and operatic music in E-flat major, [Joseph] Haydn often substituted cors anglais for oboes in this period", and also in Symphony No. 22 .
Though Mozart touched on various minor keys in his symphonies, G minor is the only minor key he used as a main key for his numbered symphonies (No. 25, and the famous No. 40). In the Classical period , symphonies in G minor almost always used four horns , two in G and two in B ♭ alto. [ 2 ]