Joan Clarke, woman who cracked Enigma cyphers with Alan Turing. Read more about sharing. Joan Clarke's ingenious work as a codebreaker during WW2 saved countless lives, and her talents were formidable enough to command the respect of some of the greatest minds of the 20th Century, despite the sexism of the time.
A semitone, also called a half step or a half tone, is the smallest musical interval commonly used in Western tonal music, and it is considered the most dissonant when sounded harmonically. It is defined as the interval between two adjacent notes in a 12-tone scale (e.g. from C to C â¯).9-tone equal temperament distinguishes between the chromatic and diatonic semitones; in this tuning, the chromatic semitone is one step of the scale (play 63.2 cents (helpÂ·info)), and the diatonic semitone is two (play 126.3 cents (helpÂ·info)).
There are two types of semitones. They are chromatic and diatonic semitones. When a semitone contains two notes with the same letter name, it is chromatic. For examples, C to C# and D to D sharp are chromatic.When the two notes have different letter names, example, C to D flat and D to E flat, the semitone is diatonic. major scale is formed with the formula W-W-H-W-W-W-H. This stands for whole step, whole step, half step, whole step, whole step, whole step half step. As weâve seen, the half steps are the semitones and the whole steps are the whole tones. There are 2 semitones and 5 whole steps.