Venice was an important and rich commercial centre, welcoming foreign merchants, businessmen dignitaries and aristocrats on the Grand Tour. The demand for entertainment was therefore high, particularly during the Carnevale, Some enterprising impresarios came up with the idea of setting up a public opera house, charging the public for the hire of boxes on a subscription system. The business turned out to be profitable. In a few years 16 theatres were built requiring a big number of new operas. By the end of 1600 the repertoire counted about 300 operas.
Monteverdi reinvents vocal music as a new relationship between the composer and his audience, using to that end his melodies of unprecedented expressivity. He creates modern opera as the public’s right to a performance he can understand, appreciate, being moved or laugh at.
The main difference between Opera and the previous polyphonic vocal music is the unique melodic line, resulting from the merging of bass and singing. In polyphonic music different vocal lines work independently, overlapping one another and making a text often incomprehensible. Opera instead offered a new way for making words expressive and intelligible, by creating a single melodic line, supported by an accompaniment.