証(あかし) - アルト is a melancholic, low-energy track by 阪井一生, 今井典子, 高橋ちはる, 西川美幸, 山内知子 from Chorus ONTA Vol.18, released November 29, 2017. It runs 4:26 at 172 BPM (344 BPM double-time) in F Major (Camelot 7B).
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