Harmony isn’t about getting others to do what you want so there can be peace between you.
It is about accepting that we are all different and letting go rather than forcing change. This brings about peace and harmony between each other.
Acceptance equals harmony.
We can choose to accept that people are uniquely different and there is no need to judge them or form opinions of them. Be at peace with it.
Or, we can spend a lifetime of suffering frustration, anger, hate, jealousy, annoyance, and so on, because they have a different view, language, opinion, they do things another way to us, they eat, dress, speak, look different. They do not fit into our conditioning of the world, or lens does not allow us to see the good in them. We are never at peace.
Different is exactly that, different, there is not a right or wrong, we are all unique souls and if we allow that to be, if we embrace others as what they are, then we will have a life of peace.