One Nation Underground is the debut album by American psychedelic folk group Pearls Before Swine. It was released on the ESP-Disk label in July 1967.
The album became the most successful ESP release ever, estimated to have sold between 100,000 and 250,000 copies. Early vinyl copies came with a small poster of the Hell panel from Hieronymus Bosch's The Garden of Earthly Delights, a detail of which was used on the front of the album sleeve.
The album presents a mixture of styles - "psychedelic folk reminiscent of Donovan collides with Farfisa-driven punk and hard-to-categorize repetitive minimalism, all thrown together with the undisciplined, creative exuberance of youth - Wikipedia
https://www.youtube.com/watch?v=erh3Bxqdwxg
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