Order of Sharps and Flats in Key Signatures
by Wes Raines
Here is how you can use the Circle of Fifths to learn the order of sharps and flats in key signatures
Draw an imaginary line between F and B-flat on the circle of fifths. The letters are the lines/spaces you would write the sharp/flats on when you are writing the key signature.
Example #1: You are writing the key of D. There are 2 sharps in the key of D. The first sharp goes on F and the second goes on C.
How do you know that?
Look on the circle of fifths, the first 2 letters going clockwise from that line are F and C.
Example #2: You are writing the key signature for A-flat. You need 4 flats. Looking at the imaginary line, you see going counter-clockwise from it, the letter names are B-flat, E-flat, A-flat, and D-flat. So you write flat signs on the B, E, A, and D lines/spaces. Those are the 4 places on the staff you put the flats when writing the key signature.
So there you have it: starting between F and B-flat, the order of sharps goes clockwise around the circle, and the order of flats goes counter-clockwise around the circle.