Operatic voices are divided into 4 categories: soprano (high female), alto (low female), tenor (high male) and bass (low male). There are also 2 intermediate voices: mezzo soprano, female voice and baritone, male voice between tenor and bass. There are many more subtle distinctions used to define the range, tone, colour and timbre of a voice. They developed as a consequence of increasingly demanding roles which required more specific vocal types.
Everywhere in the world, Italian language is popular thanks to music; not just Opera but also pop hits such as Volare or Mamma. Common Italian words are increasingly used in other languages while notation on music scores is traditionally in Italian (piano, forte, crescendo, rallentando etc…). So much so that many Italian terms used for music are now truly international, representing a substantial part of the international Italian vocabulary.
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.
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.