Harmonious (adjective)

1. Having a pleasing combination of sounds or tones.
2. Being in agreement or concord; free from conflict.
3. Being in a state of agreement or concord; peaceful.

Origin:

The word harmonious comes from the latin word harmonia meaning agreement or concord of sounds or a combination of sounds, it was first used in english in the late 16th century.

Examples:

1. The choir sang with a harmonious blend of voices.
2. The painting had a harmonious color scheme that was pleasing to the eye.
3. The couple had a harmonious relationship and were always happy together.
4. The team worked together in a harmonious way to achieve their goals.
5. The garden was filled with harmonious beauty, each flower and plant complementing the other.