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The dominant in music is the fifth note of a major or minor scale. In a C scale, the fifth and dominant note will be G. Chords built on this note are called dominant chords. In the key of C, the dominant chord will be G-B-D. Keys have the same relationship as notes, so the dominant key will be the key of the fifth note. So in C, the key of G is the dominant key. In musical theory, the dominant is written with the roman numeral "V".
- "Dominant." The Oxford Dictionary of Music, 2nd ed. rev.. Oxford Music Online. Oxford University Press, accessed December 15, 2015, (subscription needed), http://www.oxfordmusiconline.com/subscriber/article/opr/t237/e3044.