noun
natural tone
Refers to a natural, unforced tone, often in the context of voice, music, or color. Used as a noun.
彼女のナチュラルトーンな話し方が好きだ。
I like her natural tone of speaking.
この楽器はナチュラルトーンで演奏するのが難しい。
It's difficult to play this instrument with a natural tone.