Welcome to Flat Key Signature
Music Theory Sixth Floor
Before we dive into constructing Flat Key signature let's recap a bit on the sharp thing...
Ok, so hopefully youāve "clicked" that key signature itself is arrived at when creating a major scale. Right now you can do any major scale starting on any white (naturalā®) piano key (except for Fā®). Remember ātheā major scale is any scale that has 1/2 steps at scale tones 3 to 4 and at 7 to 8.
From another perspective you are just recreating the pattern of ā®1/2 steps that occur in C major from different starting notes other than C.
The only difference is you need to add accidentals (āÆās or āās) to make that happen. So far we have only used āÆās (sharps) to make that happen.
You can now start on any ā®note and create ātheā Major (Ionian) Scale. Any ā®note that is, except for Fā®. Why is that?
The Reason F is Different
The only reason Fā®is different is because of the alphabet. ...Well sort of... We treat it differently because we want the alphabet that we are so familiar with to remain intact. Let me show you.
The Flat Key Signature of F Major
Letās do our non-notational written exercise from the Music Theory Fifth Floor Page this time on Fā®.
First we write the letters from Fā® to Fā® and number them 1-8.
F1 G2 A3 B4 C5 D6 E7 F8
Then we mark where the half steps need to be to make this run of notes sound like the major scale.
F1 G2 A3/B4 C5 D6 E7/F8
Then we check is F1 to G2 a whole step? Yes.
G2 to A3? Yes.
A3 to B4? Yes. Do we want a whole step there? NO!
The major Scale is any scale that has
1/2 steps at 3 to 4 and at 7 to 8
What do we do? Make the A sharp (āÆ) you may say. Well that does indeed make a half step at 3 to 4 BUTā¦
It also makes scale tones G2 to AāÆ3 one and a half steps apart. It also doesnāt solve the other problem of scale tones B4 to C5 being half steps apart. Remember B to C is one of our ā®1/2 steps. This wonāt sound like a major scale. It will also mess up our alphabetical system by putting two A notes in the same scale! So what do we do? We start the cycle of Flat Key Signature. Hereās how.
In order to get our half steps to fall at 3 to 4 and at 7 to 8 like we want them to (keeping the alphabet intact) we need to leave the poor A note alone and pick on the note B.
What we do is we lower the B note by 1/2 step to Bā (B flat).
That gives us:
F to G whole step -1 to 2
G to A whole step ā 2 to 3
A to Bā half step 3 to 4 (scale tones 3 and 4)
Bā to C whole step - 4 to 5
C to D whole step ā 5 to 6
D to E whole step ā 6 to 7
ā¦and finally
E to F half step 7 to 8 (one of the ā®1/2 steps also now scale tones 7 to 8)
Here is that snap shot again just to remind you
What Happens Next?
If you get the idea of what is happening here you can see what is going to happen. We need to be able to play and understand the other flat keys that exist. They follow the cycle of fourths (FBEADGCF)
-the same way our sharp keys follow the cycle of fifths (FCGDAEB).
Time to move on to Music Theory Sixth Floor Page Two
If you want another perspective have a look at this lesson provided by http://www.musictheory.net/lessons/24
Many thanks to Ricci Adams at www.musictheory.net
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