Music is true Esperanto, a language of emotion. When two countries are willing to communicate through music, it may contain some kind of political goodwill, that is, the two parties want to talk in a language of music that is understandable and acceptable to each other. "Communicative", music can often bring spiritual pleasure to people. Thus creating a good atmosphere for interpersonal communication. What does this text emphasize about music? ['Effective ways to resolve cultural conflicts.', 'A diplomatic method commonly used by countries.', 'A means of interpersonal communication.', 'A tool for political communication and exchanges between nations.']