1. A style or ornament that employs haunting, phantasmal and psychedelic sounds or images to produce evocative and ethereal compositions of music, art, or photography.

2. In music; a style that employs the use of overtones and sustained tones to produce ghostly/phantasmal music.
His guitar playing evoked music, that was awash in psychedelic pedal tones, producing a variety of apparesque tonal colours.
by Buck Curran November 30, 2018
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