He joined pop singer Palito Ortega in 1972 as lead arranger, and began his work in the cinema of Argentina in 1976 for Ortega as music director in the comedy production, Dos locos en el aire.
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Lapouble became a prominent arranger and musician in the theatre, notably for Norma Aleandro, Inda Ledesma, Lito Cruz, and Juan Carlos Gené.