quarter tone
US /ˈkwɔːr.tər ˌtoʊn/
UK /ˈkwɔːr.tər ˌtoʊn/

1.
quarto de tom
an interval of a quarter of a tone, half a semitone, or 50 cents, common in some non-Western music.
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Many Middle Eastern musical traditions extensively use quarter tones.
Muitas tradições musicais do Oriente Médio usam extensivamente quartos de tom.
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The microtonal piece featured several intricate passages with quarter tones.
A peça microtonal apresentava várias passagens intrincadas com quartos de tom.