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Lesson 2: Constructing Key signatures
Cylent Beatz Production
A semitone or half step is the movement of
sharpening or flattening a note.
C > C# C > Cb
A tone or whole step consists of two semitone
C C > D C > B
Key signatures are constructed using a series of
tones and semitones.
The order of which are determined by the quality of
the scale. For example, whether it is major or
A keyboard can help in working out the steps.
The order of these steps for the major scale are:
T, T, S, T, T, T, S T = Tone S = Semitone
Using that formula to construct A major:
A – B - C# - D – E - F# - G# - A
The order of these steps for the natural minor scale
T, S, T, T, S, T, T T = Tone S = Semitone
Using that formula to construct A minor:
A – B - C - D – E - F - G – A
There exist other minor scales.
There are three minor scales, natural, harmonic
The harmonic minor is the same as the natural
minor scale except that the seventh degree is
raised by a semitone.
So, A harmonic minor will be as follows:
A – B - C - D – E - F – G# – A
For the melodic minor scale, take the natural minor
and raise both the sixth degree and seventh degree
by a semitone.
A melodic minor scale:
A – B - C - D – E – F# – G# – A