Italian is a major European language, being one of the official languages of the Organization for Security and Co-operation in Europe and one of the working languages of the Council of Europe. It is the second most widely spoken native language in the European Union with 67 million speakers (15% of the EU population) and it is spoken as a second language by 13.4 million EU citizens (3%). Including Italian speakers in non-EU European countries (such as Switzerland, Albania and the United Kingdom) and on other continents, the total number of speakers is approximately 85 million. Italian is the main working language of the Holy See, serving as the lingua franca (common language) in the Roman Catholic hierarchy as well as the official language of the Sovereign Military Order of Malta. Italian is known as the "language of music" because of its use in musical terminology and opera; numerous Italian words referring to music have become international terms taken into various languages worldwide. Its influence is also widespread in the arts and in the food and luxury goods markets.