Ambient music is a genre of music that emphasizes tone and atmosphere over traditional musical structure or rhythm. Often "peaceful" sounding and lacking composition, beat, and/or structured melody, ambient music uses textural layers of sound that can reward both passive and active listening, and encourage a sense of calm or contemplation. The genre evokes an "atmospheric", "visual", or "unobtrusive" quality. Nature soundscapes may be included, and some works use sustained or repeated notes, as in drone music. Bearing elements associated with new-age music, instruments such as the piano, strings and flute may be emulated through a synthesizer.

The genre originated in the 1960s and 1970s, when new musical instruments were being introduced to a wider market, such as the synthesizer. It was presaged by Erik Satie's furniture music and styles such as musique concrète, minimal music, Jamaican dub music and German electronic music, but was prominently named and popularized by British musician Brian Eno in 1978 with his album Ambient 1: Music for Airports; Eno opined that ambient music "must be as ignorable as it is interesting", however, in early years, there were artists that were pioneers in this genre, like Tangerine Dream, Klaus Schulze, Wendy Carlos, Kraftwerk, etc. It saw a revival towards the late 1980s with the prominence of house and techno music, growing a cult following by the 1990s.

Ambient music has not achieved large commercial success. Nevertheless, it has attained a certain degree of acclaim throughout the years, especially in the Internet age. Due to its relatively open style, ambient music often takes influences from many other genres, ranging from classical, avant-garde music, experimental music, folk, jazz, and world music, amongst others.

As an early 20th-century French composer, Erik Satie used such Dadaist-inspired explorations to create an early form of ambient/background music that he labeled "furniture music" (Musique d'ameublement). This he described as being the sort of music that could be played during a dinner to create a background atmosphere for that activity, rather than serving as the focus of attention.

In his own words, Satie sought to create "a music...which will be part of the noises of the environment, will take them into consideration. I think of it as melodious, softening the noises of the knives and forks at dinner, not dominating them, not imposing itself. It would fill up those heavy silences that sometime fall between friends dining together. It would spare them the trouble of paying attention to their own banal remarks. And at the same time it would neutralize the street noises which so indiscreetly enter into the play of conversation. To make such music would be to respond to a need."

In 1948, French composer & engineer, Pierre Schaeffer coined the term musique concrète. This experimental style of music used recordings of natural sounds that were then modified, manipulated or effected to create a composition. Shaeffer's techniques of using tape loops and splicing are considered to be the precursor to modern day sampling.

In 1952, John Cage released his famous three-movement composition 4'33 which is a performance of complete silence for four minutes and thirty-three seconds. The piece is intended to capture the ambient sounds of the venue/location of the performance and have that be the music played. Cage has been cited by seminal artists such as Brian Eno as influence.

In the 1960s, many music groups experimented with unusual methods, with some of them creating what would later be called ambient music.