This is actually quite a complex question (i was thinking about explaining this just the other day actually).
Basically we have keys in music.
Theses keys produce a set amount of notes, and from those notes chords are built.
We then make porgressions based on those chords in a key.
So for the key of C major, we have the notes:
C D E F G A B
From which these chords can be built, from the notes of C major:
Cmaj7, Dmin7, Emin7, Fmaj7, G7, Amin7, Bmin7b5
Without going into
modes too much -Check out Andrews great theory article on this, link is above-
If a progression is based around each of these chords, they all have a different
feel or
vibe (proper word is
tonality)
So say you base the progression around the C major chord -by base i mean
resolve to, or
end up at as
'home'You'll get a progresion like so:
Dmin7-G7-Amin7-
Cmaj7This will have a 'major' sound to the overall progression.
Base it around Dmin7:
Dmin7-G7-
Dmin7It will have a D Dorian sound- youll have to read through Andrews modes workout to understand this.
Each chord built of a scale, if you base a chord progression around it will have a certain 'sound'.
So if you want a major tonality/vibe, base it around the Cmajor7 chord (for the key of C major).
If you want a minor sound, base it around the Amin7 chord.
Want a dorian sound? Base it around Dmin7, the second
mode of C major.
What i will reiterate is that regardless of modes/keys, an interval will always sound the same over a particular chord.
For example play D note over C major7, it will always sound like a major 2nd, regardless of the chords place in a key.
Hopefully this is addressing what you wanted to know.
let Andrew chip in
-Ben
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This post has been edited by benhowell: Jun 15 2007, 03:44 PM