The D major scale has 7 notes: D, E, F#, G, A, B and C#. Its formula is 1 2 3 4 5 6 7 and its steps, in tones, are 1 – 1 – ½ – 1 – 1 – 1 – ½.
The major scale is the reference scale of Western music: seven notes with a clear, stable sound. It is the basis of major keys and of the chords built on them.
D major
D E F# G A B C# · 1 2 3 4 5 6 7
Colored dots: notes of the scale, the root is the darkest.