Well, Johnny Come Lately here; I just wanted to answer Byron Walcher's message of 1-21-03 in this chain as that seems a good way to also present the "
modal boxes" a bit more:
<SMALL>..."summertime", G.Gershwin. If the head starts in Cminor, third fret, wouldn't the substitution be the BdMaj7 mode at the 5th fret?</SMALL>
You're correct Byron, ...BbMaj7 DOES substitute for Cm7 ... and is probably the most commonly used scalular substitution for Cm7; But obviously Eb6 (CHORD) subs for the Cm7 chord since that's where we're playing Cm7 CHORD at. It's not because Eb6 scale subs for Cm7 because it doesn't; It's the BOX created by Eb6 and F6 together that give us the FDominant7 scale in the box that subs for Cm7. That's also the box for BbMaj7! Same identical notes; BbMaj7 scale = Cm7 scale = F7 scale, because they all have the identical same notes in their scales. BUT, the Major chords in the box ALWAYS sit on the upscale end fret of the box, while the minor chords ALWAYS sit on the downscale end fret of the box.
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Here's 5 minutes' reading (and about an hour studying) looking at it from a few different angles and with a few more details ... with some repetition ... for those that might need it massaged a little bit:
In each minor scale / mode box, the minor signature chords will ALWAYS be on the down-scale end of the box ... while the Major signature chords in their boxes will ALWAYS be on the up-scale end of the box, ... and the remaining notes not voiced in the signature chord will be in the other end of each mode's 1 whole step box. That's why Cm7 CHORD sits at the down-scale end of the box at Eb6 ... and BbMaj7 sits at the up-scale end of the box, ... with both's scales subbing for each other.
There are 4 other substitutions for Cm7 (a total of 6 subs for any chord / scale / mode) ... and they are simply the remaining modes for Bb! BbMaj7 scale = Cm7 scale = Dm7b9 scale = E#4 scale = F7 scale = Gm7b6 scale = Ahalf.dim. scale. They all play over each other because they all have the same identical notes of their Mammy BbMaj7 parent scale. It's the context we think about the notes via different roots, chords, scales, modes, etc that creates the different flavors of movements we put into those notes. But not to worry about 6 different substitutions, ...I've mapped it out where 6th chord positions alone will substitute for any scale / mode and their signature chords.
I think and use 6th chords as the substitution (rather than the Maj7) because the vast majority of us already think, navigate and play relative to the 6th chord positioning; So it's a piece of cake once we know where to place that 6th chord in substitution to get each mode's signature chord we desire, ...and get the remaining notes for the full scale that are ALWAYS just 2 frets away and straight bar to boot. For a Cm7 substitution, most of us already think "Move the C6th chord up 3 frets" to make it a minor7. Add it's remaining sale notes 2 more frets up at F6 and we get the full scale box. And every other mode is just that simple; We just gotta know where to put the box.
First is to recognize that every single mode / scale and a signature chord for every single mode / scale can be found straight-bar with all the notes of the scale and the signature chord in a single 2 fret box. All the modes are right there in the box whether we move it along the neck or not. In effect, we move the box along the neck so the mode we desire therein matches the root note we desire on the string and fret that makes that mode in the box. But it's just a heck'uv'a lot easier to think of it terms of where the box needs to be located relative to the 6th chord position. For instance, to make a I6 chord a IMaj7 chord, I know that V6 = IMaj7 so I simply play V6. If I want to make I6 an Aolean minor I just play bVI6.
Let's examine the chord E6 at the 4th fret ... and a concept we're familiar with: We move the steel bar to where the note E occurs on the 2nd string ... and the box thereby affords us the E Dominant7 box. All of the notes of E6 scale that are not on that fret are ALL 2 frets down at the 2nd fret. Remember that the 6th chord IS NOT sitting in a Maj7 box; It's sitting in a Dom7 box. When we play western swing lines off of a 6th chord and it's remaining scale notes 2 frets down from the chord, we are using a Dom7 scale. That's why we get that Dominant 9th chord located 2 frets below a 6th chord. That 9th chord voicing bottom>up is b7,9,4,5,b7,9; Which are the notes of the 6th (Dom7) scale that weren't voiced in the 6th chord's 1,3,5,6,1,3.
One of the perimeter frets in a box will be the signature chord fret, most of which we're all already familiar with and use, while the other perimeter fret will have the remaining notes of it's scale. In the case of Major chords, the remaining notes are ALWAYS 2 frets DOWN from the chord. In the case of minor chords, the remaining notes are ALWAYS 2 frets UP from the chord.
Of course Steelers know that with a non-pedal steel we only get the voicing available on the fret that's afforded by the tuning (slants out of the picture for this discussion); So in many cases we only get a signature chord that has common elements of the chord we call it. For instance, the Maj7(9) position most of us are familiar with ... G6 for CMaj7/9 for example ... gives us a voicing of 5,7,9,3,5,7 without even the root note being there, ...but the remaining notes are 2 frets down in that Maj7 box (4,6,1,9,4,6). (That makes it obvious why we can't get a decent 6th chord out of the Maj7 box but use the Dom7 box where the full 6th chord exists). Similarly, the voicing of Cm7 at the 3rd fret (Eb6) is bottom>up b3,5,b7,1,b3,5 ...AND ....ALL the remaining notes of the Cm7 scale are also straight bar 2 frets UP at F6 (4,6,1,2,4,6). The entire Cm7 scale is right there in a 2 fret box. And so are every other mode depending upon which string and fret in the box is considered root.
Boy, now THAT'S about enough nose-pickin' fer one sittin' !
ALOHA (means I don't know if I'm comin' or goin')
Denny T~
cr2003wdt
<FONT SIZE=1 COLOR="#8e236b"><p align=CENTER>[This message was edited by Denny Turner on 23 May 2003 at 06:44 PM.]</p></FONT>