Now you understand pitch on a grand orchestral scale. We turn to the smallest intervals in western music the tones and semitones.
The letters of the alphabet are separated by tones and semitones.
E to F is a semitone. Twice a semitone is a tone.
F to G is a tone. The alphabet is not equidistant.
F to G is twice the distance of E to F.
Western music is divided into 12 equidistant semitones.
How do we write the interval between F and G?
We introduce new notation.
A semitone higher than F is F#. A semitone lower than G is Gb. F# and Gb are the same pitch. They represent the semitone between F and G.
The step-like alphabetic ascension of tones and semitones is familiar to all who play the piano keyboard.
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