Castagnola was highly indignant. He treated his pupil with severity and disdain; while, on the other hand, the Romanina used every argument to inspire him with self-confidence, and to induce him to follow the career for which he was formed by nature. He consented at last: he quitted the angry lawyer, who refused even to listen to his farewell; and, at the earnest invitation of his new friend, took up his abode at her house. Marianna Bulgarelli had a society around her of distinguished men and accomplished artists, and among these Metastasio found every encouragement to pursue his new career. He studied the science of music under Porpora, the first composer of the day, and acquired a knowledge of the art which greatly assisted the melody of his verses; so that, he tells us, he never wrote any lyrical poetry without imagining an accompaniment at the same time, which regulated its cadences and modulated the sounds. His natural inclination led him to desire to write tragedies; but, on reflection, he found that it was not sufficient that tragedies should be written, if there were no actors to represent them, nor an audience which could take interest in the representation. His association with musical people, and a prima donna, led him to consider the opera as the natural drama of Italy. Operatic dramas owed their origin to Florence, the birthplace of so much that is great and admirable, and were first brought forward in 1594. After that time they fell into disrepute, till Apostolo Zeno, choosing in ancient mythology and history the groundwork of his plots, brought out pieces that acquired great popularity. To this species of composition Metastasio accordingly turned his thoughts. Marianna encouraged him to proceed; and, when he received the commission to furnish the Neapolitan theatre with an opera for the carnival of 1724, she suggested the subject of "Didone Abbandonata," or the desertion of Dido. In this, she filled the part of the unfortunate queen; and her dignity, pathos, and musical powers imparted an attraction to the piece, which filled the audience with enthusiasm, while her heart warmed with gratitude towards the poet, whose admirable conception and execution gave a scope to her talents, before denied to them. The reputation of Dido spread through Italy: during the carnival of the following year, it was acted at Venice, la Romanina being still engaged to fill the principal part. Metastasio accompanied his friend, and wrote, while in that city, another opera, called "Siroe."