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G7b9

My understanding is that one approach to naming a chord is to first identify the root. However in this case, if this is really a G7b9, the root 'G' does not appear in the chord. How am I supposed to tell that this is really a G7b9?

I do know that the function of the chord matters i.e. this is really just a V-I cadence. So I guess in that sense, I understand why one might call this a G7b9. But by looking at the chord in isolation (without the context of the following C major chord), can we tell that this is a G7b9?

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    I love the way it's called G7b9, then the b9 is pictured as #8. Then, Cmaj7 is shown with no B, but a D instead. What's it all from? I have my suspicions... Levine?
    – Tim
    Jan 14 at 9:51
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    The author is not taking the notes and identifying the chords. They are taking the given chords and presenting a possible realization.
    – PiedPiper
    Jan 14 at 10:32
  • In the bass clef you have f and b (b7 and b3), and above you have 6th and b9 followed by another 3rd (b) so this is a rootless G7b9 with a 6th in the chord. Also if it is functioning as V dominant resolution to the tonic it has to be some form of a G dominant (though it could be a tritone sub as well)
    – Pete David
    Jan 14 at 10:43
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    @Tim I get your points. As far as the G chord I think the point is to show the E upper structure triad but it’s still weak. Not to mention the 13 left out of the chord symbol. The Cmaj7 is a bad choice for a tonic chord with a root in the melody IMHO, not the original change I’m sure. C6/9 is a better choice, which is what’s there anyway. Jan 14 at 17:56
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    Maybe this should be called "How to read the Levine book". Jan 15 at 17:43
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With a Tritone for the left hand and a major triad for the right… an experienced jazz pianist would immediately recognize this as a rootless upper structure voicing.

So without any context, the options are either Db7#9 or G13b9.

The next chord (a rootless fourth voicing) helps to narrow it down to G13b9.

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  • How is G7b9 an option when there's clearly an E in that first chord? Shouldn't G13b9 be an option instead?
    – Dekkadeci
    Jan 14 at 13:07
  • Thank you. Seems like I need to study rootless voicings to better understand. I am curious: you say the options are either Db7#9 or G7b9. How about E7b9 (as mentioned in another answer)?
    – user125089
    Jan 14 at 14:34
  • By “rootless upper structure” do you mean some other instrument is playing a G natural or that there’s an implied G natural? Jan 14 at 16:35
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    @Todd Wilcox it could be either. But most commonly rootless piano voicing are used when there’s a bass instrument playing the root. Jan 14 at 17:40
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    @user125089 for E7b9 this voicing is somewhat odd, with the double 5th and the b9 as lowest note (usually the tensions are a bit higher in the voicing). But it is not impossible indeed. Jan 14 at 17:51
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The primary job of a jazz pianist is not to write chord symbols for groups of notes. The primary job of a jazz pianist is to look at already written chord symbols (or even better, know the changes without staring at a music sheet) and make an artistic contribution by coming up with notes. So if the book is about jazz piano, written for aspiring instrumentalist, then I think the examples in the book should be read the other way around:

how to read levine examples

The chord symbols do not try to be a theoretical description of the notes. And the notes don't try to be a theoretical explanation of what the chord symbols mean. The notes are an example of one possible practical realization of the chord symbols.

What comes to the enharmonic spelling of the G# note, if it's "b9", shouldn't it be an Ab? I see that E major triad as something that a jazz player would actually think about, a pianist, guitarist or a sax player just the same. When you see the chord symbol - a dominant chord - you might think "I'll play a major triad rooted a minor third below the dominant's root". So: you see "G7", you play an E major triad over it. If you want to advice the reader to look at it as an E major triad, then the spelling E - G# - B is exactly right and proper and correct.

If you think about a half-whole diminished scale over a dominant chord, which is a common style in jazz, then you can take any chord that's found in the scale and move it up and down in steps of three semitones, and you'll stay within the diminished scale. For example, take a G major, you can move that in steps of three semitones: G major, E major, C# major, Bb major. Worrying about "correct" enharmonic spellings for these is completely missing the point of what you should be thinking about here. In any case, as a jazz soloist, you're trying to make the listener feel ambiguous about the harmony and come up with things that could enharmonically exist in many different keys although maybe with different names ... the final "correct" spelling, with the advantage of hindsight of knowing where the harmony actually eventually went, might be different from how it's good to think about it while playing.

(Caveat emptor: I don't have the Levine book, but after seeing so much talk about it, I'll have to get it.)

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But by looking at the chord in isolation (without the context of the following C major chord), can we tell that this is a G7b9?

We can't. Without context I could call it E7b9 (although 9 in bass is rather unusual). So is it then not G7b9?

This seems to be a demonstration (or transcription, it's from Levine's book, isn't it?) of how an instrument (piano in this case) can realize particular harmony. The author chose to play tensions: 3 (doubled!), 7, b9 (spelled G# instead of Ab) and 13.

Tensions typically carry most of the information about harmonic motion. Fifth and root are more "boring", and in jazz are often omitted by the chord instruments. Moreover, in a band there are other instruments, in particular bass and melody instrument, which may play the tones that you omit. This even has a name: rootless voicing.

In classical music root of a 7b9 chord is also sometimes omitted, and results in a diminished seventh chord.

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  • Thank you, well explained. Your point on this being one of many possible realizations of a harmony is good. I will need to study rootless voicings more deeply.
    – user125089
    Jan 14 at 14:25
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In addition to other good points made:

For me, in the context of jazz standards like "What's New?", with the piano left hand in that range, that tritone F B is the dominant feature, with whatever-it-is in the right hand being "just harmonics". Even without seeing the C-chord next (yes, as other have said, a C6/9...), I would wager that that first measure is either some kind of G7, or else Dflat7, because of that tritone.

Either way (depending on the ambient key signature), I very often see this kind of "mis-spelling", and it's usually for some sort of readability... especially if one is thinking about "stacking" things. So although my reaction is that it's not really an Emajor triad in the right hand, I certainly have no problem knowing how to play it immediately. :)

Again, in this range, the tritone in the left hand is decisive for me. The details about higher harmonics might matter for voice-leading, etc., but the function is V7 (in some key).

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Probably because it came from a jazz resource where authors notoriously combine chord names or Roman numeral analysis with enharmonic misspellings.

Second you may not know about rootless chord voicings in jazz. Typically, rootless chord voicings involve the chord root played by some bass instrument, like the piano left hand or an upright bass player, and then the 'rootless' chord is a voicing of the other chord tones and extensions in some higher range instrument like the piano right hand or maybe a guitar.

So, for example, the bass could play a G while the piano in mid-range plays F B E to combine into a G7. Note that many lead sheets or jazz analysis might just write such a chord as G7 and not literally G13 to account for the E. That last point has been discussed in other posts about chord symbols and chord extensions.

F B E G# B enharmonically respelled as F B E Ab B as numeric chord intervals gives us 7 3 13 b9 3 where we can more easily see the flat ninth. The original spelling with a G# above a root of G technically gives us a #8, an augmented octave obscuring the flat ninth.

...the root 'G' does not appear in the chord...

Remember, in an actual performance the root will be played by someone. If this were a listening question, the perception of the root would probably be different. But, working from just the notation, the question still remains: how does one get that chord symbols G7b9 just from the given notes?

If you take either spelling and order the tones in thirds...

E G# B (D) F or B (D) F Ab (C) E

...things don't get much clearer.

How am I supposed to tell that this is really a G7b9?

You can't, and that is the nature of rootless voicings, because they are incomplete.

Let's use a different example, one more basic.

F A B E is a basic rootless voicing above G for a G7 chord.

F A B E is a basic rootless voicing above Db for a Db7alt chord, tritone substitution.

F A B E is a basic rootless voicing above D for a Dmin6 chord.

Same rootless voicing, but three different chord depending on... the root given in the bass.

You could make a similar point about incomplete voicings using the tritone. If given only the tritone of F B you could superficially say it's a G7 that would resolve to C, but in fact there is no way to tell that isn't a partial voicing of Db7, the tritone substitution that would resolve to C.

The root must be given to really know.

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    Reason for the down vote? Is someone upset that I said jazz author misspell chords? Well, it's true. Jan 14 at 16:51
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    Not my downvote - I agree that this author introduces many mis-spellings into his work, for seemingly no good purpose - in fact, it would confound many readers.
    – Tim
    Jan 15 at 9:11
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    The spelling of the right-hand notes as E-G#-B is completely justified from a player's point of view. That's how I think myself. I see "G dominant", so play a major triad rooted a minor third below G --> E major chord. AFAIK, jazz playing is full of things like that, overlaying note patterns from different perspectives and doing enharmonic re-spellings. In the player's mind, there are multiple simultaneous views, and trying to writing them out in a single "seven notes per octave" view just isn't possible. Often there end up being more than seven notes per octave. Jan 15 at 17:55
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    Well, maybe. And maybe an Ab wouldn't be a problem either. The bigger pedagogical question to me is why that is the example given, in the first chapter of a jazz piano book... to illustrate a minor second in linear movement? The very first example of something in context and it brings in rootless voicings, altered tones, and enharmonic spellings. That book, Levine's The Jazz Piano Book is both well known and horrendously organized. Jan 16 at 23:08
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    With an Ab, the E major wouldn't be so clearly visible. Implying that there could be a single correct perspective, in a genre where multiple simultaneous interpretation possibilities are specifically sought after, feels out of place. The real native language to use for jazz piano would be the piano keyboard, but since staff notation was used, something is bound to get lost in translation. In a way, I think it's just good if there's no single dominating discourse on music theory, and if people have to acknowledge different perspectives, because it is about people and culture after all. :) Jan 17 at 1:51

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