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John Petersen is an American musician who first found work composing music for the popular children's animated television series Voltron: Defender Of The Universe. Later, Petersen was hired to assist Jan Hammer on Miami Vice during the fourth season of the show, working on the episodes "Missing Hours" through to "A Bullet for Crockett". Following Vice, Petersen has worked intermittently, his only subsequent credits being the films The Keeper and Childless, and a second animated children's series, Yu-Gi-Oh!.