The word "psychedelic" was coined in 1956 by the British psychiatrist Humphry Osmond, meaning the "manifestation of the mind" under the influence of hallucinogenic substances, such as LSD. More broadly, the term came to refer to substances that alter consciousness and expand an individual's perception.
From the 1960s onwards, the concept migrated to music through the trend of artists who used hallucinogens in the creative process, seeking to subvert sensory perception and establish new sounds through experimentation. Aesthetically, psychedelic music is characterized by the use of innovative studio effects, intense distortions, and extensive solos. The lyrics often explore surreal themes, mysticism, Eastern philosophy, and spirituality. In that decade, bands like 13th Floor Elevators, Pink Floyd, The Doors, and The Beatles were some of the main exponents of psychedelic rock.
Psychedelia, however, is not limited to rock. Pop and subgenres of electronic music, such as trance and acid house, have also incorporated its elements. Currently, the term neopsychedelia is used to classify contemporary music that revives or flirts with this aesthetic.