Diatonic and chromatic
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Diatonic and chromatic are terms in music theory that are used to characterize scales. The terms are also applied to musical instruments, intervals, chords, notes, musical styles, and kinds of harmony
Diatonic Pixiphone, a brand of glockenspiel
Chromatic Pixiphone
Chromatic (rear) and diatonic harmonicas
Equal temperament
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Equal temperament is a musical temperament that divides the octave into 12 identical parts. It is a logarithmic scale with a ratio equal to the 12th root of 2. The scale unit is known as a semitone or
Diatonic and chromatic
…in common use in Western music (the major, and all forms of the minor). Chromatic most often refers to structures derived from the chromatic scale in 12-tone equal temperament, which consists of all semitones. Historically, however, it had other senses, referring in Ancient Greek music theory to a particular tuning of the…
Prince Zhu Zaiyu constructed 12 string equal temperament tuning instrument, front and back view
Zhu Zaiyu's equal temperament pitch pipes
Simon Stevin's Van de Spiegheling der singconst c. 1605