好勇鬥狠的小混混阿勇（鄭中基飾），喜歡有節奏感的東西，例如打架。可是他情緒不穩，惟獨一首在網上發表的神秘Demo，卻是他的心靈鎮靜劑。 大哥雄命令阿勇看管一個綁架回來的少女子牧（顏卓靈飾），並將她困在飄浮海上的魚排內。詭計多端的子牧多番逃走，兩人惡鬥連場，阿勇驚覺對方正是Demo的作曲人！ 為了逃走，子牧假意為躁狂的阿勇施以音樂治療，將本來劍拔弩張的關係，變成一個最奇特荒謬的處境。 有作家在坐牢時寫成巨著，子牧卻在被挾持時靈感湧現。 風聲、浪聲、水滴聲，漸漸變成一組節奏。靈感忽至的她，居然在如此處境下寫成一首動人的樂章。而子牧更發現阿勇的嗓子其實相當不錯，加上他平日打架逃跑，練就強大肺活量，音域遼闊。 原來，綁匪都有好嗓子！ 音樂，令一個人改變，令兩個人相知。他們用聲音，改變了命運，為自己的人生，配樂。
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