Two semitones equal a whole tone.
A semitone is the smallest musical interval commonly used in Western music. In an octave, there are 12 semitones. When you combine two semitones, you create a larger interval called a whole tone.
For example:
- From C to C# is one semitone.
- From C# to D is another semitone.
- Therefore, from C to D is a whole tone (two semitones).
This relationship is fundamental to understanding scales, chords, and harmony in music theory. Essentially, it's the building block for many musical concepts.