Max Steiner's "Symphonie Moderne", written for the movie, was later expanded and published in 1941.
Shown at some engagements with Warner Bros.' new Vitasound audio process. Often incorrectly called a stereophonic process, Vitasound actually combined a standard, variable width monophonic soundtrack with a second, variable width control track, located between the soundtrack and the sprocket holes, that increased loudness for certain scenes by switching on additional amplifiers and speakers.