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Cycle of 4th, 5ths etc


pip
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Hi guys

Is there anywhere on the net that clearly explains the cycle of 4ths 5ths etc? because I would like to understand it. As I am starting to explore the boundaries of interval playing and theory.

Thanks Phil

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[quote name='pip' post='38079' date='Jul 28 2007, 10:47 AM']Hi guys

Is there anywhere on the net that clearly explains the cycle of 4ths 5ths etc? because I would like to understand it. As I am starting to explore the boundaries of interval playing and theory.

Thanks Phil[/quote]

[url="http://www.dolmetsch.com/theoryintro.htm"]http://www.dolmetsch.com/theoryintro.htm[/url] - it's all in there somewhere :)

or there's Wiki - [url="http://en.wikipedia.org/wiki/Circle_of_fifths"]http://en.wikipedia.org/wiki/Circle_of_fifths[/url]

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[quote name='dlloyd' post='40914' date='Aug 3 2007, 09:36 AM']I learnt it as a kid using the old mnemonic phrase:

Father Charles Goes Down And Ends Battle

That one gives the circle of fifths in the order the sharps appear in key signatures:

FCGDAEB

The corresponding mnemonic for the circle of fourths is the same in reverse:

Battle Ends And Down Goes Charles Father

Which gives the circle of fourths in the order flats appear in key signatures:

BEADGCF

(Which is also the order of strings on a 7 string bass)

It can also be used to work out how many sharps or flats are in a key, if you remember that C major has none; sharps go in fifths and flats in fourths; and the only natural major key that has flats in it is F major.

If you wanted to know how many and which sharps were in B major for instance, you could work it out:

C=0
G=1 F#
D=2 F#,C#
A=3 F#,C#,G#
E=4 F#,C#,G#,D#
B=5 F#,C#,G#,D#,A#

Ab major:

C=0
F=1 Bb
Bb=2 Bb,Eb
Eb=3 Bb,Eb,Ab
Ab=4 Bb,Eb,Ab,Db

It also has use in modulation and chord movement.[/quote]

Wow, the easiest I've seen it explained.

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