The nice thing about chord-scale theory is that is is trying to get away from the chord symbols meaning a very specific chord... I read through the piano transcriptions of Bill Evans's solo on several tunes. He'd play the same left hand voicing on tunes that said Bb7, Bb9, Bb13, and Bb13+11. They were all Mixolydian (and Lydian Dominant on the +11) chords... It was b7 9 3 13... rootless and versatile. The right hand lines outlined all kinds of extensions from the same scale that were not included in the symbols in some cases. They are a launching point... but I think a Bb7 going to a minor (or modal interchange) needs a huge distinction from going to a major. The chord-scales are typically Mixolydian, Lydian Dom, or HW dim going to a major, and HM or ALT going to a minor (or modal interchange). This really simplifies things. Bb7b9, Bb7Alt, Bb7b13 all mean HM or MM, and Bb13, Bb13b9, and Bb7+11 mean the major kind... just things I observed in my piano hero... Hope that helps... a little OT...
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