this play [i.e. Beaumarchais's] is woven, the vastness and grandeur of the same, the multiplicity of the musical numbers that had to be made in order not to leave the actors too long unemployed, to diminish the vexation and monotony of long recitatives, and to express with varied colours the various emotions that occur, but above all in our desire to offer as it were a new kind of spectacle to a public of so refined a taste and understanding. Charles Rosen, in The Classical Style, proposes to take Da Ponte's words quite seriously, noting the "richness of the ensemble writing", which carries forward the action in a far more dramatic way than recitatives would. Rosen also suggests that the musical language of the classical style was adapted by Mozart to convey the drama: many sections of the opera musically resemble sonata form; by movement through a sequence of keys, they build up and resolve musical tension, providing a natural musical reflection of the drama. As Rosen writes: The synthesis of accelerating complexity and symmetrical resolution which was at the heart of Mozart's style enabled him to find a musical equivalent for the great stage works which were his dramatic models. The Marriage of Figaro in Mozart's version is the dramatic equal, and in many respects the superior, of Beaumarchais's work. This is demonstrated in the closing numbers of all four acts: as the drama escalates, Mozart eschews recitativi altogether and opts for increasingly sophisticated writing, bringing his characters on stage, revelling in a complex weave of solo and ensemble singing in multiple combinations, and climaxing in seven- and eight-voice tutti for acts 2 and 4. The finale of act 2, lasting 20 minutes, is one of the longest uninterrupted pieces of music Mozart ever wrote. Eight of the opera's 11 characters appear on stage in its more than 900 bars of continuous music. Mozart cleverly uses the sound of two horns playing together to represent cuckoldry, in the act 4 aria "". Verdi later used the same device in Ford's aria in Falstaff. Johannes Brahms said "In my opinion, each number in Figaro is a miracle; it is totally beyond me how anyone could create anything so perfect; nothing like it was ever done again, not even by Beethoven." Other uses of the melodies A musical phrase from the act 1 trio of The Marriage of Figaro (where Basilio