Cultural diversity and intercultural education emphasize intercultural competence, which is indispensable for our contemporary societies, which are diverse by nature. Diversity is an asset and a wealth; but it can be a source of misunderstandings and conflicts. In a multi-connected world, communication has become more and more sensitive. To fully understand but also to be understood and to avoid pitfalls that can have dreadful consequences, for example harassment on social networks and sometimes led to dramatic acts, one must be prepared. No one can claim "cultural" exclusivity or decide who is legitimate to defend or speak about a group or community. Culture is to be shared and is not the preserve of any expert or group of "exclusive" experts. However, with the tension of identity, we have observed a closure to others, resulting in trials in "cultural appropriation" or "communitarianism" which are all symptoms of extreme sensitivity and often reflect existential angst.Several concepts and notions are associated with the culture of diversity; they have been defined by the Council of Europe (since its inception in 1949) and by UNESCO (since its creation in 1945). Cultural diversity concerns communication, intercultural encounter or permutation (between people and within organizations), intercultural responsibility (within companies), intercultural learning and education (throughout life). Much work has been published on interculturalism, intercultural education or intercultural skills.Several missions and actions have been carried out by the Council of Europe and UNESCO as well as by the European Union, in particular within the framework of its Lifelong Learning and Training program, for example the European Framework of key skills to be mastered to prepare the citizens of tomorrow. Two European projects have designed tools that promote particular skills, in particular the Migrapass portfolio, which has made it possible to promote a migratory journey by expressing it in terms of skills.Universal language can help overcome cultural misunderstandings. Music, musicians and original musical formations are indeed telling illustrations of successful diversity strategies. Three ensembles are most evocative by the personality of the musicians who directed them, their history, and the diversity of the musicians who compose them - the Accentus choral ensemble (France), the Israel Philharmonic Orchestra (IPO) and the New York Arabic Orchestra (New York). The personality of the protagonists, their commitment and their achievements prove that diversity is a richness and a cement not only in the musical world.