質の良い睡眠 is a melancholic, low-energy track by ソルフェジオDNA from 細胞再生528Hz: 細胞を修復するソルフェジオ周波数528Hz, released February 9, 2021. It runs 5:50 at 140 テンポ (280 テンポ double-time) in D♭ Major (Camelot 3B).

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