I also had some experiences with Herb Ellis' method via his "All the Shapes You Are" book, part of his series of 3 method books. This volume presented 7 shapes. They are major triads, minor triads, dominant 7th and dominant 9th chords. For the shapes with major triads, there are 2 corresponding scale fingerings: major scale and dominant scale (i.e., the mixolydian mode) Some shapes have 1 dominant scale or 1 minor scale (actually dorian mode rather than natural/harmonic/melodic minor) If I understand it correctly (described in my old post), to use this method, pick an applicable "scale" over the chord you encounter during improv (obviously, major chord uses major scale, minor chord uses minor scale and dominant chord uses dominant scale) The shapes help identifying chord tones which should be emphasized in the line (e.g. start or end a phrase, or finish the line, especially for resolution to I chord) The bulk of the book consists of many example lines that demonstrate how Herb's method is to be applied, which the author merely suggested to try playing a few times and move on. I made a mistake of not analyzing and memorizing those lines at that point of my study. I was too lazy and thought I should come up with my own lines anyway but I couldn't (partly because I wasn't familiar with the fingerings enough) so I gave up on the method. Another reason why I didn't study those example lines was they are based on a single chord covering multiple bars. Real tunes usually modulate quickly, with ii-V-I in 2 bars often. I just couldn't imagine myself switching from one scale to another every 2 beats. (Later on I found out a phrase that "works" on a ii chord could also be played over the V in the ii-V and vice versa. So I could have "switched" less frequently)
I definitely see similarities between both methods: in fact, the fingerings are very similar. You could even say all of Herb's major/minor/dominant fingering could be "merged" into Jimmy's 5 major fingerings (one or two needs very minor modifications like moving the 4th fingers to the 1st finger of next string. Jimmy doesn't like stretching over 4 frets on a single string in one position, for speed I guess) and all the chord tone shapes are subset of arpeggios extracted from Jimmy's fingerings (except the 9th in dominant 9th)
I'd say Jimmy's fingering are easier to apply in a ii-V-I context because you don't need to recall 3 of Herb's fingering in the same position of the neck. Instead, just recall one of the 5 Jimmy's major scale fingering and the 3 arpeggios within it.
Both of them taught the use of approach notes (half step from above and below chord tones) for chromaticism.
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