Music terms. The octave is divided into twelve tones, and the interval between four connected tones is called a whole tone. A whole tone consists of two "semitones".

In music, the smallest distance between two adjacent tones is called a semitone, and the distance between two semitones constitutes a whole tone.

Divide the distance of the group of notes C D E F G A B into twelve equal parts, and each equal part is called a "semitone". If the distance between two tones is two "semitones", it is called a "whole tone". On keyboard instruments such as pianos and electronic keyboards, C-D, D-E, F-G, G-A, A-B, there is a black key between the two notes, and the distance between them is the whole tone; E-F, B-C, there is no black key between the two notes. The keys are separated by a semitone.