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Unseen Power is the thirteenth studio album of the Christian rock band, Petra. It was released in November 1991. The album retains a driving edge while veering away from the more commercial pop-metal sound of their previous efforts. Bob Hartman has stated that he and the producers intentionally chose to move in directions they were not instinctively inclined to go. From Wikipedia (https://en.wikipedia.org/wiki/Unseen_...) under Creative Commons Attribution CC-BY-SA 3.0 (https://creativecommons.org/licenses/...)
