diatonic scale
US /ˌdaɪ.əˈtɑːn.ɪk ˌskeɪl/
UK /ˌdaɪ.əˈtɑːn.ɪk ˌskeɪl/

1.
échelle diatonique, gamme diatonique
a seven-note musical scale that includes five whole steps and two half steps, commonly used in Western music
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Most Western music is based on the diatonic scale.
La plupart de la musique occidentale est basée sur l'échelle diatonique.
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The melody uses notes exclusively from the C major diatonic scale.
La mélodie utilise des notes exclusivement de l'échelle diatonique de do majeur.