Have you ever felt really in tune with someone else? Did you ever do an activity with someone and feel a natural connection with them? In English, we call this feeling being in perfect harmony.
When one is in perfect harmony with someone or something, it means that two different people or things are working together in unison. For example, when musicians play together in a band, they know each other’s styles and play together as one body. One can say they play music in perfect harmony together.