The easiest way to compose a diatonic scale is to press only white keys of the piano. Two consecutive keys can compose two type of intervals: tone (C-D, D-E, F-G, G-A, A-B) and semitone (E-F, B-C). In this way you achieve respectively two tones, one semitone, three tones and one semitone. This sequence can be repeated up to pleasure in the shrill and in the low tonalities .
You can notice that a tone can be divided into two semitones by a black key: since between E and F and between B and C there’s just a semitone interval, there’s no black keys between theese notes.

The chromatic scale is composed by the complete sequence of white and black keys of the piano (C, C#, D, D#, E, F, F#, G, G#, A, A#, B, C), and then it is composed by 12 semitone intervals.

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