The thing is, if you're using the idea of tonal dominants in a mode like Phrygian, you're not really doing the Phrygian mode. Traditional Phrygian style avoids tonal dominants like those largely because of the dissonance issues. Traditional church modes in general avoid dissonance, primarily for cultural reasons.MadBrain wrote:- E Phrygian: This one lets you use not only 1, but 2 different dominants! (B7 and F - F works really well as a dominant because it's basically the tritonic substitution of B). Adding in the D# to get your B7 chord doesn't work against the mode's characteristic note F, so it's no problem here, and you can even use B7b5 to add it on top. Even Bm7b5 leads you back to your root Em chord. So this one is actually practically as stable as the minor and major scales harmonically. I think the reason why it's not used in classical music that much at all is just that it doesn't fit stylistically (and is intrinsically somewhat dissonant).
Then again, pretty much every form modal music is bound up with cultural tradition - the tonal revolution shattered that connection in the west. Modes have rules. Some cultures have very much stricter rules about the ordering and usage of intervals than for the western church modes. I think this cultural connection is why some people react so viscerally to the purity of the mode being sullied.
From my perspective, I don't see anything particularly wrong musically with what you're suggesting other than you might simply be doing E minor with an altered scale rather than the E Phrygian Let's Use Dominants Mode. However, the context in which those chords were used would determine how much that is the case. Focusing on building harmony horizontally through voice leading rather than applying chords to a melody is also more likely to maintain the illusion of a mode rather than tonality.
When talking about soloing over a chord, this is pretty much what happens. It's a scale derived from a mode – I don't think most people are making stronger claims than this unless they are going for a modal feel over the entire song. But people are going to use shorthand terms to refer to stuff. And so you get it all kicking off in threads like this because they say "I played over this chord in the G Mix mode" and not "I played over this chord using notes from the scale derived from the G Mix mode".MadBrain wrote:In another order of ideas, I'm starting to think that the best way to refer to the way pop composers use modes as just a collection of pitches, without a full modal system, is to call them what they are when doing that: scales. Which would give us the appellations Dorian scale, Mixolydian scale, Lydian scale and Phrygian scale. And this has the advantage of separating them from the historical modes: Dorian mode, Phrygian mode, Lydian mode and Mixolydian mode. I think it's a justifiable terminology: the Mixolydian scale is, after all, a scale based on the pitches of the Mixolydian mode.
Does this make sense?