“Keeper” contains a fairly broad range of selections from Harry Lubin’s library of stock compositions. “Haunting Trautonium I and II” perfectly underline the mysterious prologue, while the raucous “Suicide Attempt” is used for both Eric’s reckless drive home in act one and the climactic showdown at the end of act four. Other cues used in Keeper of the Purple Twilight include the lovely “Floating Dream” and the bombastic “Evil Horror.” The music was created using an early electronic musical instrument called a Trautonium.

The Trautonium is an electronic instrument (similar to the better-known Theremin), which is probably best known for producing the bird sounds in Alfred Hitchcock’s 1963 avian nightmare The Birds.

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