They sing harmoniously.

Politicians from Brazil to New Zealand all agreed that culture helps communities live together harmoniously.

Permaculture (permanent agriculture) is the practical conscious design and maintenance of agriculturally productive ecosystems which have the diversity, stability, and resilience of natural ecosystems. It is the harmonious integration of landscape and people providing their food, energy, shelter, and other material and non-material needs in a sustainable way.

Your game is harmonious when each move is connected to another, in a logical sequence, either with the idea of improving your position or, prophylactically, avoiding the realization of an idea of your opponent.

There should be an harmonious relation between student and teacher.

They are living harmoniously.

In chess, harmonious coordination of attack and defense forces is of utmost importance.

In a good marriage we can argue harmoniously.

Harmonious spouses can even empty all the water out of the Pacific Ocean.

Magnanimity is a great treasure; harmonious affinity with others is wonderful, Detachment from name and gain averts trouble; happiness makes older people feel young.