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"I Know You" is a song recorded by American recording artist and songwriter Skylar Grey for the soundtrack to the film "Fifty Shades of Grey" (2015). The song was written by Grey and Canadian composer/producer Stephan Moccio and was co-produced by Moccio and Dan Heath. It was released as the second promotional single from the "Fifty Shades of Grey" soundtrack on February 3, 2015.