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Christoph Willibald Gluck La contesa dei numi titlepage of the libretto Kopenhagen . en Christoph Willibald Gluck La contesa dei numi titlepage of the libretto Kopenhagen europeana eu html Pietro Metastasio Christoph Willibald Gluck other versions PDold Uploaded with Operas by Gluck La contesa de numi Metastasio