ambient often consists of evolving dissonant harmonies of drones and resonances, low frequency rumbles and machine noises, sometimes supplemented by gongs, percussive rhythms, bullroarers, distorted voices and other found sounds, often processed to the point where the original sample cannot be recognized. For example, entire works may be based on radio telescope recordings (e.g. Arecibo's Trans-Plutonian Transmissions), the babbling of newborn babies (e.g. Nocturnal Emissions' Mouths of Babes), or sounds recorded through contact microphones on telegraph wires (e.g. Alan Lamb's Primal Image). Generally, the music tends to evoke a feeling of solitude, melancholy, confinement, darkness, and isolation. However, while the theme in the music tends to be "dark" in nature, some artists create more organic soundscapes. The Symphonies of the Planets series, a collection of works by Brain/Mind Research inspired by audible-frequency plasma waves recorded by the Voyager unmanned space probes, can also be considered an organic manifestation of dark ambient. Subgenres Isolationism Isolationism, also known as isolationist ambient, is a style of ambient music prominent in the 1990s. The term was coined by British musician Kevin Martin and first appeared in print in a September 1993 issue of The Wire magazine. He described it as a form of fractured, subdued music that "pushed away" listeners. In 1994 Martin curated a compilation album, Isolationism, collecting various examples of the genre. Journalist David Segal referred to it as "ambient's sinister, antisocial cousin". John Everall, owner of the Sentrax label, places the origins of "Isolationist" music in early industrial groups, krautrock, ambient music and experimental composers such John Cage, non-experimental composers such as Karlheinz Stockhausen, and others. James Plotkin identifies Brian Eno's ambient works as the greatest influence on the isolationist scene, along with American experimental music such as Illusion of Safety. As Plotkin says, See also List of dark ambient artists List of electronic music genres References Electronic music genres Ambient music Industrial music Dark music genres