1 Introduction to Music Theory: semitones/tones

In western music pitch is arranged around semitones. On the piano each key is relatively half of a tone higher then each key on its left, whether this is a black or a white key.

So the black key (2) is a semitone higher than the white key (1), but also the white key (3) is a semitone higher than key (2) and the white key (4) the same compared to the white key (3).

Whenever we play two keys with one key in between them, we play a (whole) tone. So we can play 1 2 3 2 1 from different positions at the keyboard, but the phrase sounds the same.

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