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Tones can be a noun or a verb.
As a noun: The tones from the piano are quite beautiful.
As a verb: Exercise tones up muscles.
wolf tones
A regular pattern of tones is exactly what it sounds like it would be. A regular pattern of tones is a pattern of tones that repeats regularly.
Auburn is primarily red with some brown tones.
the titanic was 45,500 tones