It is the predominant key of Maurice Ravel's Introduction and Allegro for harp, flute, clarinet and string quartet. It is more often used as a main key for piano works, such as the impromptus of Chopin and Schubert. The same applies to the B flat major scale by starting on the root note of B flat (1st fret A string) and applying the TTSTTTS formula.Like F-sharp major, G-flat major is rarely chosen as the main key for orchestral works. For A major, starting on the root note of A (open string) we go up by a tone to the 2nd interval (B) and from there we go up another tone to the 3rd (C#), then up by a semitone to the 4th (D) and so on according to the TTSTTTS formula, until we are finally taken to the higher octave of our original starting note (A) on the 12th fret. The fret-board diagrams below give examples with A major and B flat major scales. This formula applies to all major scales. The major scale sequence is Tone, Tone, Semitone, Tone, Tone, Tone, Semitone (TTSTTTS for short). On the guitar a Tone is 2 frets apart while a Semitone is 1 fret apart. The major scale is made up of a sequence of Tone and Semitone spaces between its notes.
So a piece of music in the key of G major will therefore be based on the G major scale, a piece in the key of D major based on the scale of D major, and so on. When a piece of music is referred to as being in a certain key, such as the key of G major, this means it is based on that scale.
Major Scales – Most music (in the West) is based on the major scale.
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