If an artist or designer chooses a colour scheme in which the colours are in the natural order according to their tone, the colours are said to be harmonious. In a harmonious colour scheme, orange will be lighter than blue, as it is on the colour wheel.
If a colour scheme has orange with a very pale blue, then the colours are discordant, as they don’t follow their natural order of tonal value, where orange is lighter than blue. If black is added to the orange to make it darker than the blue, then the colours are similarly discordant.
Both harmonious and discordant colour schemes can be used to good effect.
The simple colour wheel above shows the primary and secondary colours and the twelve-colour wheel shows the primary, secondary and tertiary (or intermediate) colours. In the twelve-colour wheel you can see the tone and value of the colours more easily, as we move from yellow, the lightest (or the highest value) colour to violet, the lowest value colour.
From http://eplanner.education.tas.gov.au/item/edres/f8ade9bd-b921-a331-21e1-b598634ce5ab/2/Colour.zip/index_colour.htm
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