The dominant note in a major scale or minor scale is the 5th of the scale. The 5th is called the dominant because of its harmonic strength and because it is the strongest note other than the tonic of the key. The dominant 7 chord is built from the dominant note of the key. The dominant note is also found in the tonic chord. If the tonic is the King of the key, the dominant is the Queen. The dominant is also the interval used to build the cycle of fifths or the cycle of dominants. The Perfect 5th is the strongest fundamental in the harmonic overtone series.