Review question / Objective: This study aims to investigate, review, and asses existing literature concerning audio intervention to reduce acute pain. Condition being studied: The study will focus on acute pain experienced by adults in any diseases or surgical procedures. Eligibility criteria: This study will exclude papers published older than ten years ago to collect updated data, non RCTs, non-English literature, paper with combined interventions, and papers with an incomplete essential statical value of pain for meta-analysis.