Finding the key from a key signature
The order of sharps and flats
Sharps are always written in the order F, C, G. Flats are always written in the order B, E, A. Later grades add D, A, E, B to the sharps and D, G, C, F to the flats.
Quick check
Which sharp comes first in a key signature?
Last sharp, second-last flat
With sharps, the key is a semitone above the last sharp. With flats, the key is the second-last flat. One flat on its own is F major.
Quick check
A key signature has two flats, B flat and E flat. Which major key is it?
Remember
- Sharps: F, C, G. Flats: B, E, A.
- Sharps: a semitone above the last sharp. Flats: the second-last flat.
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