Captain Naegeli! wrote:
I've learned most of what I know about modes from The Guitar Grimoire. So for C Dorian, I would flat the 3rd and the 7th? Thats goes for all dorian mode scales, correct?
That is absolutely correct. A more general approach would be to say that, for any Dorian scale you want to construct, start with the Major scale for that root, and flat the 3rd and 7th tones of the scale. A Dorian would be A Major with a flat 3rd (C instead of C#) and flat 7th (G instead of G#,) etc. F Dorian would have an Ab as the 3rd tone, and an Eb as the 7th tone.
Even more general - a scale and a mode are essentially the same thing. In theory, you might differentiate between them by saying that a scale is a set of notes
in a certain order, whereas a mode is that same set of notes in
any order, but for practical purposes they are the same. In your OP, you said "the Dorian mode starts on the second tone of a scale...", which I would revise to say "To find the Dorian mode, play a Major scale starting on its second step." So to find Bb Dorian, you could play an Ab Major scale
starting on Bb - that's Bb Dorian.
Once you understand how each mode differs from the Major scale, you can construct any mode on any root note. If you use C Major (easy, since, on a piano keyboard, it's all white keys,) you find the following modes:
- starting on D (2nd tone of C Major) gives you D Dorian - with the formula (relative to Major) of b3 and b7
- starting on E (3rd tone of C Major) gives you E Phrygian - b2, b3, b6, b7
- starting on F (4th tone) gives you Lydian - #4
- starting on G (5th tone) gives you Mixolydian - b7
- starting on A (6th tone) gives you Aeolian - b3, b6, b7
- starting on B (7th tone) gives you Locrian - b2, b3, b5, b6, b7
Now you can use those formulae to build
any mode on
any root. It may take some practice to be able to do this "on the fly" in a useful, musical way, but you have all the information you need, it's just a question of doing it until it becomes second nature.