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This picture marked the feature-length directing and producing debut of James A. FitzPatrick, who previously had produced many short travelogues. Although a July 28, 1944 Hollywood Reporter news item announced that the film was to be the first in a five-picture series produced by FitzPatrick for Republic, to be shot in Mexico, FitzPatrick did not make any additional films in Mexico for the studio. The news item also stated that the picture would be shot in color, although the completed film is in black and white.
Song of Mexico was shot simultaneously with a nine-reel Spanish-language version titled Cancion de Mexico. Released in Mexico City on June 30, 1946, Cancion de Mexico was copyrighted by Republic on September 28, 1945 (LP13522). A December 1944 Hollywood Reporter news item indicated that the picture was shot at the Churubusco Studios in Mexico City, but a modern, Mexican source states that the studio used was CLASA, also in Mexico City. Much background footage of Mexico was shot for the picture, using both American and Mexican crews. Entertainers appearing in the longer, Spanish-language version, who do not appear in the English version, include comedian Tin Tan and the singing group Tro Calaveras. Additional technical credits for Cancion de Mexico include Scr adpt Edmundo Santos and Sidney Fields; Production Manager Luis Snchez Tello; and Assistant Director Winfield Snchez.