Artist 
Writer Color harmony
A pleasing and harmonious arrangement of colors in a painting. Much of the pleasure from viewing a painting is derived from the color harmony used in it. This harmony is basically an orderly relationship of colors, just as a musical harmony is an orderly relationship of notes.
Color harmonies are commonly described using a color wheel. These wheels show the relationship of the hues. There are five major types of color harmonies you need to know about. They are: balanced, complementary, analogous, hybrid analogous, and complementary. Balanced harmonies use colors evenly spaced around the color wheel. The number of colors is usually three (a triad) or four (a tetrad).
See the Color Building Block for more information.