Same sounding key, different written map

Compare the two written maps

Switch F# and Gb. Both use the major recipe and the same sounding tonic in equal temperament. F# major includes E#; Gb major includes Cb.

Major: W W H W W W H

Fifteen standard signatures name twelve sounding major tonics

The usual written major signatures run from seven flats through no alterations to seven sharps: fifteen signatures. Three pairs overlap in this tuning: B/Cb, F#/Gb, and C#/Db.

Theoretical spellings with double accidentals also exist, so fifteen is the count of these standard signatures, not a limit on every written key name. Choose a spelling that makes the surrounding score readable.

Pair the standard enharmonic major keys

Tap something on the left, then tap what it pairs with.

Does Cb require a pitch between B and C on the guitar?

Takeaways

• Standard enharmonic keys can share sound while organizing notation differently.