American International Pictures would frequently make use of frozen dollars and cheaper European facilities by sending composers Les Baxter and Ronald Stein to record their scores in London, Munich and Rome. Baxter recounted in a 1981 interview for Soundtrack! that he was sent to Rome in 1967 to score The Glass Sphinx, but was not allowed to conduct the orchestra because of rulings by the Italian music unions. Fortunately, legendary film conductor Franco Ferrara was persuaded to come out of retirement.