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Tonic
↬In music, the tonic is the first scale degree of the diatonic scale and the tonal center or final resolution tone that is commonly used in the final cadence in tonal classical music, popular music, and traditional music. In the movable do solfège system, the tonic note is sung as do.
Subdominant
↬subdominant, in Western music, the fourth note of the diatonic (seven-note) scale (e.g., F in a scale based on C), so named because it lies at the interval of a fifth below the tonic; by contrast, the dominant lies at the fifth above the tonic (e.g., G in a scale based on C).
Dominant
↬In music, the dominant is the fifth scale degree of the diatonic scale. It is called the dominant because it is second in importance to the first scale degree, the tonic. In the movable do solfège system, the dominant note is sung as "So". The triad built on the dominant note is called the dominant chord.
