Ninth
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In music, a ninth is a compound interval consisting of an octave plus a second.
Like the second, the interval of a ninth is classified as a dissonance in common practice tonality. Since a ninth is a larger than a second, its sonority level is considered less dense.[1]
A ninth chord is a chord that encompasses the interval of a ninth when arranged in close position with the root in the bass.[2]
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 (help·info). 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 (help·info), and would usually be expected to resolve into a chord of F major (the implied key, C being the dominant of F).
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".[5] The 9th and 7th usually resolve downward to the 5th and 3rd of I.[5]
The minor ninth chord is played with the third and seventh both flattened. The formula is 1, ♭3, 5, ♭7, 9. This chord is written as Cm9. This chord has a more "bluesy" sound and fits very well with the dominant 9th.
Play (help·info)An added ninth chord is a major triad with an added ninth. Thus, Cadd9 consists of C E G and D. (The D, which might be called an added second, is two fifths up from the root.) Added ninth chords differ from other ninth chords because the seventh is not included.
The Hendrix chord uses a sharpened ninth. This is, enharmonically, the flatted third, and is tonally ambiguous or bitonal.
[edit] See also
[edit] Sources
- ^ Westergaard, Peter, An Introduction to Tonal Theory. W.W. Norton, 1975. p. 74.
- ^ Sadie, Stanley, ed. (1980). "Ninth chord", p.252, The New Grove Dictionary of Music and Musicians, vol. 13. ISBN 1-56159-174-2.
- ^ Christiansen, Corey (2006). Mel Bay Rock Guitar Photo Chords, p.45. ISBN: 078667458X.
- ^ Aranjo, Karl (2000). Guitar Chord Guru: The Chord Book, Your Guide for Success!, p.5. ISBN: 1569221596. Gives the chord also in first position one semitone lower with root on B
- ^ a b c Benward & Saker (2009). Music in Theory and Practice: Volume II, p.183-84. Eighth Edition. ISBN 978-0-07-310188-0.
- ^ Walter Everett (Autumn, 2004). "A Royal Scam: The Abstruse and Ironic Bop-Rock Harmony of Steely Dan", p.208-209, Music Theory Spectrum, Vol. 26, No. 2, pp. 201-235.
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