The original score of El Prometeo (Prometheus) is held in the Leopoldine Library in Vienna. It dates from 1669 and was written by Antonio Draghi, a composer who was also a singer, notably in the operas of Cavalli. For the first time in history, an Italian set a text in Spanish. The last act of El Prometeo has disappeared. But since thelibretto of this act has survived, Leonardo García Alarcón decided to rewrite all the music for it. ‘I immersed myself in Draghi’s music in order to understand his style, his favourite intervals, the type of melody he composed and the type of basso continuo he was fond of, so as to try to produce a score that is worthy of him.