Western major scales consist of five whole tones and two semitones in fixed arrangement

Evidence

The diatonic scale divides an octave into seven notes and into repeated octaves. The intervals between adjacent pitches are five whole tones and two semitones. The order of the intervals in the Western major scale has two whole tones followed by one semitone, three whole tones and one semitone, ending at the octave of the first note. — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 1301

Categorization

• DEFINE: Explains the structural intervals and construction of the diatonic scale.