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I was trying to create a chord progression in C major with borrowed chords from C based modes. There aren't too many "in-depth" materials about how to do this, and what I found says: "just try, maybe something will work". Pff...so I tried and played this:

Am (A C E)
G°7 (G A# C# E)
Em (E G B)

And I was wondering why and how it is working? So I analyzed and I saw the G°'s notes are resolving to the Em's notes.
If I write down the distance of the notes:

G -> G = 0
E -> E = 0
A# -> B = 1

Finally I got 1. Can I say that two chords can be put together if the number is less then X?
Is it worth it to calculate this?

Another example could be A (AC#E)-> B (BD#F#). There is an "easy to see" movement, but can it be written down by a rule? It can be very philosophical...in the end the question will be: "Why is music working?"

Even I don't know what I am looking for, maybe a rule for "putting together chords". Or a new point of view how I should look at chord progressions. But I feel there is something about it.

Sorry if this was a bit chaotic, I just can't put a finger on it. Thanks in advance.

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    There is no general rule about which chords can go together, other than the rule that any chord can follow any other chord. Some specific styles have evolved "rules". What you have discovered is that chords that have tones in common can sit together well, that the movement of the voices can be a significant factor, and you may have noticed that the particular voicings of the chords matter. What you should probably be looking into is voice-leading, if you are looking for materials to study. – ex nihilo May 11 at 17:26
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    Possible duplicate of Can one measure the "distance" between chords? If so, how? – Richard May 13 at 13:39
  • If you're into programming and toying with music that way, the Music21 library for Python might not be a bad place to start web.mit.edu/music21 – piiperi Reinstate Monica May 13 at 19:47
  • Im actually a programmer ^^ thanks – Gery May 14 at 11:23
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Fuzzy answer to a fuzzy question.

This question seems to arise from a myth or misconception about what chords and chord progressions "are" i.e. what they do. Chords are building blocks for providing and altering the harmonic context, which exists in the listener's head and is basically a set of expectations against which incoming pitches are evaluated. Play Em9 - Ebm9 - Dm9 - Db13 - C13. Works great, but good luck trying to construct a metric function of the form Distance(Chord1, Chord2) that outputs a single number and that would give good "fitness" numbers for any pair of consecutive chords in that progression. The harmonic context is a black box in your head, you feed sound into it, and it changes all the time. Even if sound stops, the harmonic context keeps on changing anyway as time goes on. Or take something as simple as C - F - Fm - C. Do you want your function to say that the combination F - Fm works well ... always? Or only in specific situations?

The myth or misconception is that a chord is a harmonic context in and of itself. Or that "key + chord" is the context. Or that it's a universal biological mechanism without cultural and individual variation.

A good chord progression moves away from "home", creating some kind of tension, which can be released or left unreleased. Or maybe the next chord tells "it was just an illusion and this the real reality". What kind of a function could say, with a single number, how much is exactly the right amount of tension for some purpose.

I think the thing you're looking for is, how the harmonic context works, and how it can be manipulated in a controlled way. You need to develop some kind of a model of it. Things like the tonic - are we home now, and if not, where would home be? What notes could I play now and how would they make me feel about things? If I play note X now, how will it affect the set of notes I could play to do Z? It's not a single-dimensional thing.

Like David Bowling says, one way to construct chord progressions is voice leading. Take one of the sounding notes and move it a step to some direction, then fill in the rest with notes that accomplish what you want to do to the harmonic context. Do you want to move closer to home? Further away from home? Lean more on the subdominant or dominant side? Move over to the relative minor/major? Or do you want to make it more or less ambiguous to know where we are?

The only general advice I can give is, learn to play songs by ear as "chords and melody". Do modifications to the songs' chords and melodies, and learn how it changes the set of possibilities.

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A hesitant yes if you're only examining voice-leading.

Generally, the farther the notes in a chord have to move to resolve to the notes of the second chord, the less smooth the movement is. However, that doesn't mean that closer/less movement is always better. For example, C+ to C has an average movement of 1/3 semitone, but it's generally less functional than G to C, with an average of 1 semitone. As one starts to use this as a measure of value of chords in a progression, it breaks down, losing its utility. I don't recommend your proposed method for predictive use.

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