Improve this chrordname

• Jan 24, 2018 - 17:02

At minimum there needs to be a space between the b9 and 13.

Attachment Size
b9 13_.pdf 14.73 KB

Comments

Wouldn't be the correct spelling C7b9b13 or C7(b9b13)? Or do you want to insert a C7b9add13?
It could be confusing, if there's no indication before the 13.

Normally one would not list multiple unaltered extensions - you have both a 7 and a 13. The usual way to write that chord would be C13b9, which avoids the issue entirely. There are also some conventions that do call for multiple unaltered extension to be listed, and these normally use either parentheses or commas or both. For example, C7b9(13) or C7(b9,13). Any of these will format well. But indeed, a space would work to. I wouldn't recommend that over any of the alternatives I mentioned though.

In reply to by xavierjazz

Under normal conditions, (in dominant chords) 13 and b9 shouldn't be used in the same place.
b9 and/or b13 are used for the minor-key signal. example: G7b9(b13) => Cm // G7b9: Bass:G; Chord: f, ab, b, eb
natural 9 and 13 are used for the Major-key signal. example: G7 => C // G7: Bass:G; Chord: f, a, b, e (same as G13)
Notice: In the above examples: 11th degree should be sharp or not used in dominant chords. otherwise the third degree is suspended.

In this case you should show the unusual 13th degree in parentheses:
G7b9(13). => Bass: G; Chord: f, ab, b, e
So the player doesn't get confused.

In reply to by Ziya Mete Demircan

I won't go so far as to say 13 and b9 wouldn't normally be used together. Sure, theoretically speaking, b9 suggests a minor key and 13 major. But in major keys it's common to borrow elements of minor key harmony. Sometimes we might borrow both the b13 and b9, bb it taking only one or the other is common too. For instance, a song in F major, C13b9 could be a good choice if the melody features a prominent A.

In reply to by Marc Sabatella

I use it at some endings and some voicings (without 5th) // see attachment

Theoretically, we can see this chord in a harmonic-major key or on a dim scale. (1)
example1: f, g, a, bb, c, db, e, f <= F harmonic-major -> 5th degree C7b9(13) or C13(b9)
example2: e, f#, g, a, bb, c, db, eb <= on a dim. scale. -> C7b9(13) or C13(b9)

(1) However, a good approach (preparation) should be made when using this chord.
eg: Gm9, C13(b9), // F
or: BbMaj7, C13(b9), // F

Attachment Size
Ending.mscz 6.86 KB

In reply to by xavierjazz

In jazz 7 chords almost always include the 13th. The main reason is that this allows for elegant voice leading in the most common sequences: IIm7-V7 (lower the 7 of IIm7 a half tone & you have V7 (with a 13th). In the sequence IIm7b5 V7alt the solution is even simpler: V7alt is identical but a minor 3rd jump up from IIm7b5.
test.jpg

In reply to by xavierjazz

The root is C (or E). In jazz, the bass player plays the root, so the pianist does not have to (but in the case of the E7sus he does, in this example). I think in terms of voicings, and one hand is not big enough to play a real 13.
The e a b d sounds admittedly a bit harsh, but that a major 7 (in the right hand) is fully comptible with a M6/9 chord is shown below (first bars of Tenderly)
test.jpg

In reply to by elsewhere

If you look at your example, you will see that the 1st chord is not the same as the one that you are talking about. The G,Bb,C,F does not have the 7th in it. Your prior example "The e a b d sounds admittedly a bit harsh" is not the same, it would be e,g,a,d which speaks to my point that the 6/9 voicing does not include the 7th.

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