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個々の音楽活動が縁で知り合った3人が1年間に及ぶセッション・楽曲制作の後2012年トリオ結成。
アフリカに起源を持ち、西洋音楽において発展を遂げたマリンバ(鍵盤打楽器)をサウンドの中心に置き、その他にベース・打楽器の3人という他に類を見ない編成でメンバーがそれぞれの音楽活動で接しているクラシック・ジャズ・ポップス・民族音楽などのジャンルを独自の視点で融合させ楽曲制作を行っている。
音楽における既存の概念を打破すべく、ユニット名にUnderground(秘密結社)を用いている。
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