In the aria, un bel di from madame butterfly, one can hear the high woman's voice and orchestra.
This is a group of instrumentals with different sections playing classical music.
In the aria, the opening is softer than the closing when comparing the dynamic levels and a soaring vocal melody is what best describes the opening of the un bel di aria.
In conclusion, what one can hear in the un bel di aria is the high woman's voice and orchestra.
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