On Jazzology chapter 2, exercise 6, example 2, I have to identify this chord (if it exists):

enter image description here

I thought that it was Cmaj7(b9). My train of thought was (from the lowest to the highest note):

C -> 1st
E -> 3rd
B -> major 7th
Db -> b9.

But I looked at the solution and I saw that the chord displayed is wrong; there isn't any such chord.

The only thing I can see that could be wrong is adding the b9 to a major 7th chord.

Am I allowed to add a b9 to a major 7th chord in Jazz?

  • 6
    You're allowed to do whatever you want, really. But I get your meaning. :) – Almo Aug 4 '14 at 14:29
  • 1
    Are you allowed to go outside after 9pm? ;) – Grey Sep 5 '14 at 14:55
  • There seems to be some errors in the answer key to Jazzology. Some were fixed in a later edition I believe. There are erratas on the internet though. (Not saying that it's the case here, but it's good to know). It's a shame they didn't do better proofreading, since it's an otherwise good book. – Meaningful Username Apr 24 '15 at 11:59

Adding a b9 to a major 7th chord creates a very dissonant sound because the chord then has two different notes that are a half step away from the root. The resolution would be tricky because the b9 would want to go down a half step and so would the 7th and the root needs to go somewhere.

That being said however, I found a few voicing that sound good for it though and it seems it would work well as a non functioning passing tone. As Sir Duck would say :

If it sounds good, it is good.

So as long as it fits wherever you put it, it should be fine.

When playing around with the concept I found going from a C9 then letting the D go down to a Db then going to an Fsus4 finally resolving to an F. Not the prettiest sounding progression ever, but I like it.

enter image description here

As for voicings, inverting the chord does not work. I did not find a voicing outside of root position that would work. Spacing out the root, 7th, and b9th really help pad the dissonance. Omitting the 5th also helps. The voicing I liked best is below and has all the notes.

enter image description here

  • @Shevliaskovic - I find it important to bring up Function when we talk about unorthodox chord voicings/extensions. You can add whatever you want to a chord and describe it by what best represents it but the function changes. Typically you would not find a b9 on a Maj7 chord because of its dissonance. This dissonance desires a resolution, while usually a Maj7 chord does not require resolution. Real point being that you can create these chords and call them what you like but it would not be advisable to place a b9 on a Maj7 chord when reading a chart because it has a different Function. – Basstickler Apr 24 '15 at 14:05

You can do whatever you want, which is the beauty of Jazz. It's more a matter of whether other people will still call what you're doing Jazz.

I've implied a flat 9 (which I generally consider an energized root rather than a lowered second) in a piece with a simple, whole-note melody within Db maj of Db-C-D-Db. This works to my ear (and is followed by G maj, E maj, Db maj, to give you some context).

It is going to have more 'dissonance', but this can work fine depending on how you do it. Playing those notes in different octaves and/or with different instruments whose timbres are distinctively different are two tricks. Avoiding playing the two notes together or moving among them quickly are two more. On the other hand, sometimes the extra tension among notes is something we want. Consider Jerry Lee Lewis's right-hand clusters in some of his soloing, or the tense, stabbing strings portion of Stravinsky's Rite of Spring (Dance of the Young Maidens).

Digressing a little, I think that a lot of Westerners, upon hearing a raised root, expect a minor 7th, but you can get a nice and unusual mood from having both a leading tone above and below, and providing the same for the 5th can work well with this, too. For example, C-C#-E-F#-G-G#-B-C .

Here's an example of this sort of thing, and note that if we were analyzing as Jazz we'd probably imagine a 9th which contains the elements you mentioned:

There are major 7ths in this piece, though not all of the 7ths are major. To feel how the notes play together, if you have the means you may want to run this piece through delay or reverb so that the +1 and -1 rub together.

Not all music picks either a major or minor 7th, 3rd, or raised 4th over a "perfect 4th" and sticks to it, and in fact I prefer to avoid this scale-derived nomenclature unless communicating with others who rely on it, as it engenders a mindset which encourages such adherences. To me it's more freeing to think in terms of scale degree while remembering the relative resonances between degrees. Some Jazz traditionalists seem to frown upon this and prefer the prevailing nomenclature.

One more I happened to notice after my last edit:

Very nicely expresses the idea of those two notes, at least one way of using them. Start at 4:30.


I believe this is exactly what BBNG makes use of in their song CS60 on the first chord when the melody comes in. It sounds to me like an Ab major7 (b9) than then resolves down to the root, G minor and continues to Eb and then basically D minor (the diatonic VI and v respectively). The melody notes go from b9 to major 7 and it works really well in giving it this strange Eastern flavor that people in previous answers have referred to. I think the quavering pitch on the lead synth helps to make enforce that as well. The half and whole step movement throughout the progression on this first part, I think, contribute to the overall strength of the progression.

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