Major Flat Keys The rules for determining major flat keys are: The key of C major has no sharps or flats. The key of F major has one flat. For key signatures having two to seven flats, the name of the major key is the name of the next to the last flat (the flat 2nd from the right).

Major Flat Keys

The rules for determining major flat keys are:

The key of C major has no sharps or flats.
The key of F major has one flat.
For key signatures having two to seven flats, the name of the major key is the name of the next to the last flat (the flat 2nd from the right).