The 5 RULES

• The key of C major or A minor has no sharps (#) or flats (b)

• The key of F major or D minor has only one flat (Bb)

• The last sharp written in the key signature from left to right, add on semitone, (one fret) equals the major key.

• The second to last flat (left to right) in the key signature is the major key.

• The Relative Minor tonic is a 6th of the major key. To decide if the key is major or minor, read ahead in the music.