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Spencer Nilsen (born April 9, 1961) is an American video game music composer. He is best known for his soundtracks to the Sega CD versions of Batman Returns, Ecco the Dolphin, Ecco: The Tides of Time, Jurassic Park, The Adventures of Batman & Robin and The Amazing Spider-Man vs. The Kingpin as well as the North American version of Sonic CD. He has also worked on a number of film and television scores and released a new-age album titled Architects of Change in 1989.