A nineteen-year-old multi-instrumentalist recorded nearly every sound on this record himself by layering dozens of different instruments in a tiny studio. It famously became the first release for Virgin Records and served as the haunting, unmistakable soundtrack to The Exorcist.

Progressive rock fans often cite this as a masterclass in minimalist composition and intricate studio production. The hypnotic, repetitive motifs create a dense, atmospheric landscape that defined the experimental spirit of the early seventies.