In the second season of CBS’s original The Twilight Zone series, CBS music director Lud Gluskin was tasked with finding the show its own special sound, and thus the iconic theme tune was born. Simplistic, yet hair-raising, the music was derived from two short cues written by French avant-garde composer Marius Constant, who had originally created the music as part of a background score that, until Gluskin unearthed it, lived sleepily in CBS’s musical archive. Gluskin took snippets of two pieces, “Entrange 3” (Strange No. 3) and “Milieu 2” (Middle No. 2), to form the dramatic guitar plinks and orchestral bursts that warn us of a reality that comes with a twist.