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The chords shown below are already compatible with the C Major scale. These are the diatonic chords.

              I     ii     iii     IV      V     vi     viidim

C major = C , Dm , Em , F , G , Am , Bdim

But given all these different chords that work in the key, a smaller subset of highly common progressions exists. For example, some such common progressions are:

I-IV-V

I-vi-IV-V

ii-V-I

Why would one limit themselves to these common chord progressions?

closed as unclear what you're asking by Tetsujin, David Bowling, user19146, jdjazz, Dom Aug 7 '18 at 13:12

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

  • Sorry, what do you mean by "common chords" or "harmonic" in this question? – Dekkadeci Aug 5 '18 at 12:54
  • Common chord progressions in major keys are: * I – IV – V* I – vi – IV – V* ii – V – I* – Xcrain Aug 5 '18 at 13:17
  • There's a big difference between the phrases "common chord" and "common chord progression." And again what do you mean by "harmonic"? – LSM07 Aug 5 '18 at 14:42
  • WIthin C major scale, – Xcrain Aug 5 '18 at 14:43
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    @Xcrain, Please read over my edit and let me know if this is a good way to write your question. Are you asking why one would use a common chord progression when there are many more possibilities to create from the list of 7 diatonic C major chords? – jdjazz Aug 5 '18 at 16:25
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Chords have functions. Chord Functions

There is a reason for the order and number of chords to express harmony. Each chord has a function as stated in image.

There are common progressions because the chords please the ear using that number of chords and types throughout history. I-IV-V has been used throughout history. The V leading to the I. The ii-V-I for example is a common turn around. The tension created resolves at the Tonic.

Composers use the other chords for more expression if they choose to.

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The question isn't making a lot of sense, but if I translate it one way, it's like asking why do we write a whole sentence/paragraph only in one language?

Simple answer, it works better that way! Except in music, the order of chords is less important than the order of words in a sentence - albeit using words from the same language.

All the chords quoted are diatonic to C major - they blend with each other, and fit well together. Not the only way to play, but certainly pleasing to the ear, and easy to understand.

With several re-edits to the question, the answer still stands.

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