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In music theory, a diatonic scale (from the Greek διατονικος, meaning "[progressing] through tones", also known as the heptatonia prima and set form 7-35) is a seven-note musical scale comprising five whole-tone and two half-tone steps, in which the half-steps are maximally separated. Thus between each of the two half-steps lie either two or three whole-steps, with the pattern repeating at the octave. The term diatonic originally referred to the diatonic genus, one of the three genera of the ancient Greeks.