Nitpick away, my friend

Actually, you have raised a very interesting point concerning the nature of the ninth tone in half-diminished (m7b5) chords.
During the earlier days of jazz, the ninth tone in half diminished chords was most commonly b9. If you listen to swing-era instrumentalists, they most commonly employ the b9. In terms of scale theory, they use the Locrian, or 7th mode of the major scale. For example, an A half diminished (m7b5) chord would come from the Bb major scale:
Am7b5 Locrian mode of Bb major
or "A Locrian"
1-----------------------3--------|
2--------------------------3--5--|
3--0--------------2--3-----------|
4--------------3-----------------|
5--0-----2--3--------------------|
6--0(6---------------------------|
7--------------------------------|
8--0-----------------------------|
9--------------------------------|
10-------------------------------|
If you were listening to Erroll Garner, or Joe Pass, or Oscar Peterson, that's likely the scale they would use; that's the era they are from. And, Jeff is right, the natural ninth would clash.
However, later on in jazz history, people started to employ the
natural ninth tone in the chords and scales for a half-diminished chord. If you listen to Herbie Hancock, or Bill Evans, they do it all the time. Some people's ears do not accept the natural ninth in a half diminished chord. Myself, I'm kind of in the middle. I use a sparingly few single note runs that employ the natural ninth.. I stick mostly with the above-mentioned Locrian mode. I do, however, use the natural ninth tone in half-diminished chord voicings alot (like the previously posted example for Stella).
Those that use the natural ninth in half diminished chords use a different scale. For this chord, you would use the 6th mode of the Melodic Minor scale. For the example of A half diminished, it would be derived from the C melodic minor scale:
Half diminished mode of the
C melodic minor scale (also known
as Locrian #2)
1----------------3--------
2-------------------3--5--
3----------2--3-----------
4----2--3-----------------
5--2----------------------
6-------------------------
7-------------------------
8-------------------------
9-------------------------
10------------------------
So, it's a matter of personal taste. It's nice to have choices. Later, when you get into chords like 7#9 , there are numerous choices of scales to use for them. And, correspondingly, numerous ways to voice the chord, expressing different elements according to taste.
For an example, listen to two different piano pickers play "Autumn Leaves"... Erroll Garner on his "Concert by the Sea" album (all Locrian mode) versus Bill Evans on his "Portraits in Jazz" album (mostly the half diminished or Locrian #2 mode).
For anyone to whom these albums are inaccessible, I might recommend dredging up the old post Jerry Gleason and I did last year (?), posting 4 bar segments of "autumn leaves". I distinctly remember ripping off a nice Locrian #2 move from Bill Evans and posting it as such... while the rest of the half diminished chords were generally handled with Locrian #1.
You may use pockets on the neck to play these scales that are different than my examples; that's fine.
Thus endeth another chapter in the Steel Guitar Forum Jazz Theory Series

-John
<font size=1> *whew*
<FONT SIZE=1 COLOR="#8e236b"><p align=CENTER>[This message was edited by John Steele on 13 January 2002 at 12:01 PM.]</p></FONT>