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A basso porto (At the Lower Harbour) is an opera in three acts by the Italian composer Niccola Spinelli. The opera sets an Italian-language libretto by Eugene Checchi, based on Goffredo Cognetti's 1889 play O voto. It premiered to critical success at the Cologne Opera on April 18, 1894, sung in a German translation by Ludwig Hartmann and Otto Hess. This watercolour illustration depicts the set design by Riccardo Salvadori for act 1 of the opera's premiere. A basso porto is set in the slums of Naples, and Spinelli included mandolins and guitars in his orchestral score.Set design credit: Riccardo Salvadori