Acoustic music comprises music that solely or primarily uses instruments which produce sound through entirely acoustic means, as opposed to electric or electronic means. The retronym "acoustic music" appeared after the advent of electric instruments, such as the electric guitar, electric violin, electric organ and synthesizer.
中文翻譯“純音”不是很準確,沒有把其中的奧秘點出來,按英文的解釋,應該是指“純樂器演奏,不加電子音”。