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BARBIE's 3rd single "I don't know".The song was written and composed by Kazuya Sakuragi, who created it from a new approach.Expanded the world view of barbie and brought out an attractive singing voice.It expresses the "escape from a difficult world" that everyone feels.

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    First in the universe! The pink singing voice that existed before BARBIE was born reverberates 30 times per second between the earth and the moon even in a vacuum. Thunderstorms, and the earth is chaotic. The pink sky of Paris seen through the gaps of the clouds is the eternal light that harbors God. Thank you.

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