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Originally Posted by kp_funk I hope I am not asking a question that has been asked already. |
So what if it has? Interactive discussion is often more useful than archived stuff.
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If I have have please point me to that thread so I can read it. However, I have been reading about the circle of fifths but I do not understand it's application, why I need to know it, and how to use it to it's fullest.
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The cycle of fifths is a fantastic theoretical tool... it goes like this...
C, G, D, A, E, B, F#, C#, G#, D#, A#, E#, B#(C)
B# is enharmonically the same as C (that means it's the same note), so the whole thing just starts again.
It's most basic function is in knowing what notes you can play in a given key... or the converse, knowing what key you're in from a given set of notes.
You can use it to work out the key you're in from the number of sharps in the key signature...
You know that there are no sharps or flats in the Key of C major, right? What if there was one sharp? That's the key of G major. Two sharps? That's D major.
C, G, D... that's following the cycle of fifths.
If you were to see six sharps in the key signature, you'd know by referring to the cycle of fifths that it is the key of F# major.
What order do the sharps come in?
F#, C#, G#, D#, A#, E#, B#
One sharp is the key of G major and the sharpened note is F#. D major has two... F# and C#. A major has F#, C# and G#... that's following the cycle of fifths again.
Flat keys, you go backward from C in the cycle of fourths...
C, F, Bb, Eb, Ab, Db, Gb, Cb, Fb, Bbb, Ebb, Abb, Dbb(C)
(Don't worry about the "bb"s for now, I just put them in to bring the cycle back to C.)
If you see one flat the key is F major. Three flats it's Eb major. etc.
The order in which the flats appear is...
Bb, Eb, Ab, Db, Gb, Cb, Fb
So Eb major which has three flats as we saw above, has Bb, Eb and Ab.
Music theory uses a lot of mnemonics to help you remember stuff like this. The one I learned was Father Charles Goes Down And Ends Battle for the order in which the sharps come in keys and reverse the order of the words for the flats: Battle Ends and Down Goes Charles Father. That was from a more innocent age and you might want to use your own!