thumb|upright|Frontispiece of Il teatro alla moda His progressive operatic style caused him some trouble with more conservative musicians such as Benedetto Marcello, a magistrate and amateur musician who wrote a pamphlet denouncing Vivaldi and his operas. The pamphlet, Il teatro alla moda, attacks the composer even though it does not mention him directly. The cover drawing shows a boat (the San Angelo), on the left end of which stands a little angel wearing a priest's hat and playing the violin. The Marcello family claimed ownership of the Teatro San Angelo, and a long legal battle had been fought with the management for its restitution, without success. The obscure text under the engraving mentions non-existent places and names: for example, ALDIVIVA is an anagram of "A. Vivaldi".
thumb|upright|Frontispiece of Il teatro alla moda His progressive operatic style caused him some trouble with more conservative musicians such as Benedetto Marcello, a magistrate and amateur musician who wrote a pamphlet denouncing Vivaldi and his operas. The pamphlet, Il teatro alla moda, attacks the composer even though it does not mention him directly. The cover drawing shows a boat (the San Angelo), on the left end of which stands a little angel wearing a priest's hat and playing the violin. The Marcello family claimed ownership of the Teatro San Angelo and a long legal battle had been fought with the management for its restitution, without success. The obscure text under the engraving mentions non-existent places and names: for example, ALDIVIVA is an anagram of "A. Vivaldi".