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An F double sharp is a whole step above an F, making it enharmonically equivalent to a G. These alterations apply to the note as if it were a "natural", regardless of the key signature (see the F in measure 2 of the Chopin example below).
The predominant tuning system in Western music is twelve-tone equal temperament (12 TET), where each octave is divided into twelve equivalent half steps or semitones. The notes F and G are a whole step apart, so the note one semitone above F (F ♯) and the note one semitone below G (G ♭) indicate the same pitch.
For example, the interval from C to D is a major second, as the note D lies two semitones above C, and the two notes are notated on adjacent staff positions. Diminished , minor and augmented seconds are notated on adjacent staff positions as well, but consist of a different number of semitones (zero, one, and three).
One variant of the supertonic seventh chord is the supertonic diminished seventh [3] with the raised supertonic, which equals the lowered third through enharmonic equivalence (in C: D ♯ =E ♭). The term supertonic may also refer to a relationship of musical keys. For example, relative to the key of C major, the key of D major (or D minor) is ...
The term scale step is sometimes used synonymously with scale degree, but it may alternatively refer to the distance between two successive and adjacent scale degrees (see steps and skips). The terms " whole step " and " half step " are commonly used as interval names (though "whole scale step" or "half scale step" are not used).
Standard tuning but with the 6th string lowered one and a half steps. Used by Sevendust tuned one and a half-step down (which goes as: A#-F#-B-E-G#-C#) on some songs from Home through Alpha. Drop C in standard variation – C-A-D-G-B-E Standard tuning but with the 6th string lowered two whole steps.
Each octatonic scale has exactly two modes: the first begins its ascent with a whole step, while the second begins its ascent with a half step . These modes are sometimes referred to as the whole step/half-step diminished scale and the half-step/whole step diminished scale, respectively. [10]
A quarter-tone flat, half flat, or demiflat indicates the use of quarter tones; it may be marked with various symbols including a flat with a slash or a reversed flat sign (). A three-quarter-tone flat, flat and a half or sesquiflat, is represented by a demiflat and a whole flat ().