Allan Holdsworth: "Reaching for the uncommon chord"
Nicolas Slonimsky: "Thesaurus of Scales and Melodic Patterns"
Are these books good for learning more about the obscure, diminished-sounding alien sound of Holdsworth etc...? I just want to learn what to base myself around to be able to create a similar sound to Holdsworth, and be able to delve into it more than just: "Play harmonic major, whole-tone and the half-whole diminished. Also use legato."
Basically, are they useful? I know how all basic 7ths, 9ths, 11ths, aug, dim etc chords are made (though I can't play every inversion of every chord on the spot, except for major/minor/diminished, major 7th and some minor), and I know basic chord theory.
I want to learn more though, and Holdsworth is interesting. His sound is used really well by Fredrik Thordendal in the hardcore metal band Meshugga, and I'd like to implement some of that atonal, unresolved sound in my playing.