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In page Un Chien Andalou:

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During the original 1929 screening in Paris, Buñuel selected music which he played live on a gramophone. Modern prints of the film feature a soundtrack consisting of excerpts from Richard Wagner's "Liebestod" from his opera Tristan und Isolde and a recording of two Argentinian tangos, "Tango Argentino" and "Recuerdos" by the Vicente Alvarez & Carlos Otero et son orchestre. They were first added to a print of the film in 1960 under Buñuel's supervision.[1]