Hailing from Iceland, SVANFRIDUR were a four-piece who in the summer of 1972 recorded a single album, titled "What's Hidden There?". The album, recorded in London and released at the time only in a few dozen copies, can be considered one of the most interesting examples of heavy progressive rock mixed with influences from local folk music. SVANFRIDUR's compositions feature complex vocal harmonies and an original, inventive use of violin and Moog synthesizers, courtesy of guest musician and arranger Sigurdur Johnsson. "What's Hidden There?" was rescued from obscurity by Graham Brook, founder and owner of record label Hi-Note, and released on CD in 1995.