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.
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.