"More than one way to skin a cat"
Perspective.
Mike I think the approach to understanding and applying theory is
what determines how good the willing student progresses.
The "lessons" can easily progress much to fast. What I mean is it easier
to "know" and apply the information in ones playing.
Because of what I believe your state of mind may be I'd like to offer the following- although
I think you know...it's just not organized thoughts.
The "harmonized major scale". It is everything that is being discussed.
When one is looking for or trying to determine a "key center" the harmonized major scale
is what they are looking for.
When one is applying "modal" ideas they are playing/thinking multiple harmonized scales.
If one doesn't get a handle on those two thoughts then things can get really confusing quickly.
Now I'll try to give an example(s)....that you can play/ apply so it can be heard.
For this know that this process may envolve more than one "key" or "harmonized major scale" but the main focus is on one key. I'll use the key of "C" and from a lead player point
of view.
First the scale tones- C-D-E-F-G-A-B-C
Then one harmonizes the tones to generate the "Harmonized Major Scale"
Cmaj7-Dm7-Em7-Fmaj7-G7-Am7-Bm7b5-Cmaj7
Diatonic lead playing would be all natural notes of the key.
One would easily realize that no "modal" or "alterations" are applied.
Modal playing applied to the key of "C"- keep this simple and limited until you are certain
you understand.
Understanding the "Harmonized Major Scale" - How does one really know what key they are in if one can play (modal) notes from different keys? Well now, that is the confusing part isn't it? That is exactly why one should limit the theory to one step at a time.
Remember- rules are only good until you know how to break them.
There are only two chords that tell you exactly what the key may be.
The 5th and the 7th - In "C" that is the "G7" and the Bm7b5.
If we know that is the current rule then it stands to reason that all the other
chords could be in other keys. So take inventory....
There are 2 majors and 3 minors-
2 majors are the 1st and the 4th - Cmaj and Fmaj.
3 minors are the 2nd, 3rd, and 6th- Dm, Em, Am
Knowing that there are two majors we can know that there are 2 different keys that each
one could be in.
Knowing that there are three minors we can know that there are 3 different keys that each
could be in.
MAN! That is COOL!
If you're still with me....now you can do some modal playing and really here the value of it.
An organized approach and you will be able to keep track of the knowledge and the sound.
So one at a time....
The "Cmaj" .....first we know it can be in two keys.
It can be in the 1st position as the tonic or it can be in the 4th.
If we play over it thinking of it as in the first position then it's simply playing in the key of "C".
But if we play over it thinking that it as being in the 4th position....well now we have modal
thoughts....we no longer think "key of C".....we think key of "G".
C-D-E-F#-G-A-B-C
So now I can practice playing leads over a Cmaj chord thinking of two different keys...C and G. The F# being the difference.
If that is completely understood then one can move to the next major, the 4th in "C"
which is the Fmaj and quickly determine it could be the tonic, 1st position, key of F or it could be in the 4th position, key of C.
F-G-A-Bb-C-D-E-F .....Bb note being the difference.
This exact train of thought is applied to the 3 minor chords...Dm-Em-Am...each being found
in three different keys.
MAN! That is a lot of keys that a lead player may be playing in over ONE key ( C in this )
Cmaj- could play in C or G
Dm - could play in keys of C, Bb, F
Em - could play in keys of C, D, G
Fmaj- could play in keys of C , F
G7---C
Am - could play in keys of C, G, F
Bm7b5---C
Now if you want to ...give each one of them their Greek names.
I'm at work and did this really fast...please correct me if/as needed.