Marius Constant (February 7, 1925, Bucharest-May 15, 2004 in Paris) was a Romanian-born French composer and conductor. His most famous scores were two little pieces, which together became the famous Twilight Zone theme song. Constant traveled from Romania to Paris in 1945. In Paris he studied composition with Nadia Boulanger, Olivier Messiaen and Arthur Honegger, and conducting with Jean Fournet.

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