Beck and his crew were able to obtain library music from a host of older films (music tracks that had been composed by Henry Mancini, Hans J. Salter, and even a track from Heinz Roemheld). These films include "Creature from the Black Lagoon", "Bend of the River", "Untamed Frontier", "The Golden Horde", "Frankenstein Meets the Wolf Man", "Man Made Monster", "Thunder on the Hill", "While the City Sleeps", "Against All Flags", "The Monster That Challenged the World", "The Deerslayer" and music from the TV series "Wichita Town". Cues from these scores were used to almost completely replace the original Japanese score by Akira Ifukube and give the film a more Western sound. They also obtained stock footage from the film "The Mysterians" from RKO (the film's U.S. copyright holder at the time) which was used not only to represent the ICS, but which was also utilized during the film's climax. Stock footage of a massive earthquake from "The Mysterians" was employed to make the earthquake caused by Kong and Godzilla's plummet into the ocean much more violent than the tame tremor seen in the Japanese version. This added footage features massive tidal waves, flooded valleys, and the ground splitting open swallowing up various huts.