Scales in General
The tonal material of music arranged in order of rising pitches is a scale. There are a large number of scales because there are many varieties of tonal materials in different periods and in different countries (e.g. China). I shall show here the two main scale streams that are integrated in the European music: The Major scales and the Minor scales.

The Major scale tone intervals arrangement is: T-T-S-T-T-T-S (T = Tone, S = Semi-tone)
The Minor scale tone intervals arrangement is: T-S-T-T-S-T-T (natural minor scale)
The minor has two more variations besides the Natural Minor: Harmonic Minor: T-S-T-T-S-T+-S and Melodic Minor: T-S-T-T-T-T-S.

Each scale can be transposed by starting from any tone of the twelve defined tones - but that change the key signature!

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