what you meant by installing harmony
whatever the human group, tensions arise.
Normal results of normal differences.
We noticed (our company gives trainings) that "100% male groups" are sometimes very close to heavy disputes.
And "it is just enough to put a woman inside" and all tensions go down,to a level of "mutual a acceptance"
= the woman installed/brought harmony.
Persons = music instruments.
Different instruments may play a nice music. If YES "harmony is installed"