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If a composer could say what he had to say in words he would not bother trying to say it in music.  ~Gustav Mahler

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Cycle of Fifths

{jcomments on}[The below article was extracted from the original article from wikipedia]

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Major and minor keys that share the same signature are called relative; so C major is the relative major of A minor, and C minor is the relative minor of E major. The relative major is a minor third above the tonic of the minor. For example, since the key signature of G major has one sharp (see major scales for how to find this), its relative minor, E minor, also has one sharp in its key signature.

Music may be written in an enharmonic scale (e.g. C minor, which only has four sharps in its key signature, compared to the theoretical eight flats required for D minor). The following are enharmonic equivalents:

Key Sig.
Major Scale
Minor Scale
5/7
B/C major
g/a minor
6/6
F/G major
d/e minor
7/5
C/D major
a/b minor

Double sharps/double flats can be written as accidentals, but not as part of a key signature. For example:

D Minor Key Signature: E + A + D + G + C + F + Bdouble flat (the B is now double flatted and therefore, notated after the single accidentals, which obviously do not include the B)

D Natural Minor = D E F G A Bdouble flat C D

D Melodic Minor (Ascending + Descending) = D E F G A B C D C Bdouble flat A G F E D

D Harmonic Minor = D E F G A Bdouble flat C D


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