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Notes that are shown as sharp or flat in a key signature will be played that way in every octave—e.g., a key signature with a B ♭ indicates that every B is played as a B ♭. A key signature indicates the prevailing key of the music and eliminates the need to use accidentals for the notes that are always flat or sharp in that key. A key ...
Although B major is usually considered a remote key (due to its distance from C major in the circle of fifths and fairly large number of sharps), Frédéric Chopin regarded its scale as the easiest of all to play on the piano, as its black notes fit the natural positions of the fingers well; as a consequence he often assigned it first to beginning piano students, leaving the scale of C major ...
Use of key signature usual or unusual 15 equal temperament: 15-tet scale on C. Play ... Play ⓘ 1 3 ♯ 4 5 7: 2W-W-H-2W-H ...
Some keys (such as C ♯ major with seven sharps) may be written as an enharmonically equivalent key (D ♭ major with five flats in this case). 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.
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.
In a typical keyboard layout, black note keys have uniform width, and white note keys have uniform width and uniform spacing at the front of the keyboard. In the larger gaps between the black keys, the width of the natural notes C, D and E differ slightly from the width of keys F, G, A and B. This allows close to uniform spacing of 12 keys per ...
Dominant seventh sharp nine / Hendrix chord: Play ... Play ⓘ 3-11A: 0 3 7: Minor Thirteenth flat ninth chord [2] Play ...
In rare cases, the flat keys may be extended further: F ♭ → B → E → A → D → G → C. requiring double flats in the key signature. These are called theoretical key signatures, based on the impracticality of their use, rather than the simpler, equivalent key in 12 TET. This principle applies similarly to the sharp keys.