The Key Signature
A piece of music based on a major scale=major key.
A piece of music based on a minor scale=minor key.
Each major and minor and major scale has a specific number of sharps or flats; 0 to 7.
Key signature - Consists of sharp and flat signs following the clef at the beginning of the staff.
Circle of 5ths
Order of sharps - F#,C#,G#,D#,A#,E#,B#
Order of flats - Bb,Eb,Ab,Db,Gb,Cb,Fb