Acoustic music is music that solely or primarily uses instruments that produce sound through 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.
Performers of acoustic music often increase the volume of their output using electronic amplifiers. However, these amplification devices remain separate from the amplified instrument and reproduce its natural sound accurately. Often a microphone is placed in front of an acoustic instrument which is then wired up to an amplifier.
It has its origins in the folk music of the 1960s.  Following the increasing popularity of the television show MTV Unplugged during the 1990s, acoustic (though in most cases still electrically amplified) performances by musicians (most notably grunge bands) who usually rely on electronic instruments became colloquially referred to as "unplugged" performances. The trend has also been dubbed as "acoustic rock" in some cases.
Writing for Splendid, music reviewer Craig Conley suggests, "When music is labeled acoustic, unplugged, or unwired, the assumption seems to be that other types of music are cluttered by technology and overproduction and therefore aren't as pure".
Acoustic music also avoids the use of wind instruments, primarily because of their association with commercial, electrified styles.
- Safire, William, "On Language: Retronym", New York Times Magazine, January 7, 2007
- Randel 2003, p. 289.
- Jermance 2003, p. 16.
- Ilic 2013, p. 44.
- Conley, Craig (August 16, 1999). "Review: Unwired: Acoustic Music from around the World". Splendid. Archived from the original on 25 December 2008. Retrieved November 17, 2008.
- Randel, Don Michael (2003). The Harvard Dictionary of Music. Harvard University Press. ISBN 978-0-674-01163-2.
- Jermance, Frank (2003). Navigating the Music Industry: Current Issues & Business Models. Hal Leonard Corporation. ISBN 978-0-634-02652-2.
- Ilic, Dr Ljubica (2013). Music and the Modern Condition: Investigating the Boundaries. Ashgate Publishing, Ltd. ISBN 978-1-4094-9411-9.