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Prof. Ruth Fridman graduated from the Municipal Conservatory of Music "Manuel de Falla". She is President of the International Music Society for Pre-natal Development, U.S.A. The author wishes to acknowledge her editors, Paidos and Guadalupe, for letting her quote some fragments from previous articles.
Address correspondence to: Coronel Diaz 1564 6[dagger] "C"-1425-Buenos Aires, Argentina.