IPA: /ˌdaɪəˈtɒnɪk/
KK: /daɪəˈtɑnɪk/
Relating to a musical scale that uses only the seven notes of a standard scale without any extra notes or alterations.
The song is composed using a diatonic scale, which gives it a traditional sound.
Diatonic → It is formed from "dia-" (meaning through or across) and "tonos" (meaning tone or tension). The term diatonic refers to a scale that spans through a series of tones, typically consisting of seven distinct pitches.
Think of 'through' ('dia-') as moving across a series of 'tones' ('tonos') — that's why diatonic relates to a scale that includes a range of tones.