Here’s a handy guide to identifying key signatures

Minor Keys and Key Signatures:

No Sharps – A Minor
One Sharp – E Minor
Two Sharps – B Minor
Three Sharps – F# Minor
Four Sharps – C# Minor
Five Sharps – G# Minor
No Flats – A Minor
One Flat – D Minor
Two Flats – G Minor
Three Flats – C Minor
Four Flats – F Minor
Five Flats – B Flat Minor
Six Flats – E Flat Minor

Major Keys and Key Signatures:

No Sharps – C Major
One Sharp – G Major
Two Sharps – D Major
Three Sharps – A Major
Four Sharps – E Major
Five Sharps – B Major
Six Sharps – F# Major
Seven Sharps – C# Major
No Flats – C Major
One Flat – F Major
Two Flats – B Flat Major
Three Flats – E Flat Major
Four Flats – A Flat Major
Five Flats – D Flat Major
Six Flats – G Flat Major
Seven Flats – C Flat Major