drewfx1
Jeff, did you bother to look at the tune in question? It's not cycling through keys in ii-V-I or anything like that.
Correct me if I'm wrong:
Gmaj Gmin Dmaj B7
IV iv I VI7
Emin Gmaj Dmaj Amaj
ii IV I V
Key of D major.
Now we have an obvious problem if someone's starting out with theory and looking at it in terms of key - 2 of the first 4 chords don't fit the key.
Now do you want people to look at it in terms of key changes there? Should they play B mixolydian over the B7 (from D major/Ionian leading into E dorian)?
Or should they stay in key and play a B natural (major 3rd) over the Gmin chord and D natural (minor 3rd) over the B7 (Bmaj) chord?
Or you could stay in D major and account for the notes in those chords that don't fit the key (Bb in the Gmin and D# in the B7). If you take a chord scale approach and look at the preceding and following chords (as I previously wrote) there is a likelihood that it will take you in this direction - even if you aren't thinking in terms of the key.
Otherwise you have to explain what's going on with those chords in terms of more advanced theory. And again with the next progression.
And as to my supposedly getting "caught". You're just missing it entirely - you don't have to think in terms of key to play in key. Whether you think in terms of key or in terms of scales, if the scales fit the key anyway, then it's all the same - you're just looking at it from a different angle.
You can think in terms of key of D major, a D major scale, D Ionian mode, or D E F# G A B C# D. It's all the same thing.
And you might look at what I wrote:
Essentially you can think of it as playing the chord tones plus some additional notes. For a scale with 7 different notes, a full 7th chord will tell you 4 of these 7 notes. The key, or the next or preceding chord - or your own creativity or desire - will tell you the other 3 notes.
Don't jump on me just because I'm trying to lay out some very BASIC ideas about how you can use theory.
Sheesh!
That Gmin that "didn't fit",
does fit as iv is a borrowed chord (from D minor). And how does G Major (IV) not fit the key of D? That B7? Classically, that's not "permitted." More than likely that is a V/ii which precedes ii (B7-Em). Now, you can play notes walking to the target chord tone as long as you graze the chord tone or you'll get some dissonance. It may be desired, but there's the "Inside-Out, Back In Again" guideline!
However, given the last portion of you're statement, you're marring the line between modes and scales/keys - they are distinct entities! This is the most common mistake! Scales deal with seeing notes - modes deal with seeing
sounds! Yes, the parent scale as a reference is used to figure out modes, but they're still pretty different; yet, very easy to confuse and blur. I believe this has to do with how modes are traditionally taught. If only they were taught by using the parent scale and altered requisite notes; however, that's one of the "broken rules," we learn later.
You are right in that songs do come in a modal variety as well; however, how can you say that there is no sense of key when a I or perhaps a V pops up? Clearly, you stated key in the above progression, but you could have said: D Ionian. Why didn't you? Its probably because Ionian (and Aeolian) are naturally picked up by the ear since
keys come in these two flavors (Major/minor). I get it. To improv over a Dorian vamp (ii7/7b5/ii9-V7/V7alt/V13) one may think Ionian or Major), but sticking with one or the other does avoid confusion; yet, don't play the I unless you then what the Ionian vibe.
I've had and continue to have "slightly different POV" discussions on iBM, but even folks there say that too much theory can impede on wonderful musical ideas. One can just make noise, but not knowing how and/or why won't change that it's still noise. Even if it's good noise. I don't think Jeff or any theory student here is pushing one definite way and how can that happen since we were taught many of the same methods, different ones as well. I also would
not say that Jeff jumped down your throat by pointing out some mistakes. I've made and still make mistakes, too. I think the issue is giving not necessarily too much advice, but throwing ot all the different ways to skin a cat. If a person is unable to grasp one way, it may not be easier to grasp four other methods - especially when they aren't all that different.
Music is very ambiguous and it is its ambiguity that makes it special - even when you throw all the theory out the window (Don't or it's just atrocious!). You don't have to know everything or sound like you do, but you gotta know a little something. So, no, you're not wrong, but neither is Jeff; however, he does sound a bit more knowledgeable on the subject. (And this is such a good thread. Let's not ruin it!)