The rapidity with which the new style advanced may be judged from the fact that seven years after the production of "Euridice" we meet with an opera containing a duet, and a few years later with one containing instrumental descriptions. The composer, who appears to have been the first gifted with a real genius for operatic composition, was Claudio Monteverde (1568-1651). Already many other composers had sought to follow Peri, and Mantua, Bologna, and Venice became homes of opera. Monteverde was a student of the old contrapuntal style, but his entire genius was out of sympathy with it. He became chapel master to the Duke of Mantua, and at his invitation prepared, as one of the festival plays for the marriage of Francesco Gonzaga with Margherita, Infanta of Savoy, in 1647, his "Arianna," which, according to the testimony of a contemporary, "visibly moved the whole theatre to tears." The lament of Arianna over the departure of her faithless lover must have amazed the public of that day by its simple, melodious pathos. It approaches the modern arioso in style, and is really expressive. So successful was "Arianna" that Monteverde was asked to compose another opera for 1608. This was his "Orfeo," the libretto being on the same story as that of Peri's "Euridice." The work begins with a prelude, eight measures in five part harmony for trumpets and other instruments, followed by a short passage of contrasting nature. This is to be played three times before the rising of the curtain. After this overture there is a prologue of five speeches in recitative delivered by a character called La Musica Prologo, who represents the genius of music. In his prologue he invites attention to the story which he relates. The opera begins with a recitative by a shepherd, and this is followed by a five part chorus, with accompaniment of the full orchestra, consisting of the instruments enumerated in Chapter XI. The work then proceeds in recitative, varied by choruses, duets, and trios. There are no solo arias. The aria form had not yet been developed. Here is part of a duet from Monteverde's "Orfeo." [Music: Monteverde's "Orfeo".] APOLLO AND ORPHEUS ASCEND TO HEAVEN, SINGING:-- Duet: Saliam Saliam Can-tan - - - - - d'al cie - - - - lo - - - Saliam - - - - Can-tan - - - - - d'al cie lo Dove ha vir-tu ve-ra-ce De-gno pre-mio di se Dove ha vir-tu ve-ra-ce De-gno pre-mio di se di-let to e pa-ce - - - - - - - - Dove ha vir-tu ve-ra-ce De-gno pre-mio di se Dove ha vir-tu ve-ra-ce De-gno pre-mio di se di-let - to - e pa-ce. di-let - to - e pa-ce.