The Italiann tenor, Gennaro de Sica, had first worked as a bookkeeper at the Bank of Naples and a public servant in a ministry in Rome, but then trained his voice at the Conservatorio Umberto Giordano in Foggia and with the famous baritone Carlo Tagliabue at the Accademia di Santa Cecilia in Rome. He won several singing competitions including the Concours Francesco Viñas in Barcelona, the International Radio Competition in Munich, competitions in Toulouse and Spoleto.
Gennaro de Sica made his stage debut at the Teatro Sperimentale of Spoleto in 1963 as Ferrando in Cosi fan tutte. His career took place in Italy on the one hand at opera houses in Bologna, Genoa, Milan, Florence and Naples, on the other hand, as in West Germany. There he sang at the Stadttheater of Regensburg (1965-1967), the Staatstheater Darmstadt (1967-1969), the Nationaltheater Mannheim (1969-1972); and under guest engagement at the Theater am Gärtnerplatz in Munich (1976-1980). He performed at the Opera of Frankfurt a.M., at the Staatstheater of Karlsruhe, in Nuremberg, Bonn and Kiel, also as a guest at the Royal Opera in Copenhagen. Highlights in his repertoire for the stage were roles such as Don Ottavio in Don Giovanni, Tamino in Zauberflöte, the title role in Fra Diavolo by Auber, Chapelou in Postillon de Lonjumeau by Adam, Ernesto in Don Pasquale, Nemorino in Elisir d'Amore, Lyonel in Flotow's Martha, Count Almaviva in Rossini's Il barbiere di Siviglia', the title role in Le Comte Ory, Don Ramiro in La Cenerentola, Lindoro in L'Italiana in Algeri, Narciso in Il Turco in Italia, Paolino in Cimarosa's Matrimonio Segreto, Lenski in Eugene Onegin by Tchaikovsky, the Duke in Rigoletto, Alfredo in La Traviata, Fenton in Falstaff by Verdi, David in Meistersinger and the Italian singer in Rosenkavalier by R. Strauss. The singer, who lived in Dieburg in Hesse, performed as a concert soloist, also in an extensive repertoire.