Identifying Sharp Key Signatures on the Staff
Most music students have probably seen this simple strategy for identifying sharp key signatures.
Look at the last sharp in the key signature and step up to name the key. As I introduce new scales to my piano students following the Circle of 5ths, I point out that the new sharp is the leading tone or 7th note of the scale to reinforce this pattern on the piano keys in addition to the staff notation.
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G (new sharp F#)
D (F#, new sharp C#)
A (F#, C#, new sharp G#)