Dominant Ninth
A dominant ninth is a dominant chord with a ninth. A ninth chord, as an extended chord, typically includes the seventh along with the basic triad structure. Thus, a Cmaj9 consists of C E G B and D play. When the symbol "9" is not preceded by the word "major" or "maj", the implied seventh is a dominant seventh—e.g. a C9 consists of C E G B♭ and D play, and would usually be expected to resolve into a chord of F major (the implied key, C being the dominant of F). The ninth is commonly chromatically altered by half-step either up or down to create more tension and dissonance. Fétis tuned the chord 4:5:6:7:9.
In the common practice period, "the root, 3rd, 7th, and 9th are the most common factors present in the V9 chord," with the 5th, "typically omitted". The 9th and 7th usually resolve downward to the 5th and 3rd of I.
Example of tonic dominant ninth chords include White Cherry's "Play That Funky Music".
Read more about this topic: Ninth Chord
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