Have you met someone with the magical ability to play along with any song or tune they like?
These people have probably not done a deal with the devil, but have instead learned about the primary triads.
As long as you know the three primary triads belonging to a particular scale or key, you can successfully harmonize any melody based on that scale/key.
For both major and minor scales/keys the primary triads are those build on the first, fourth and fifth scale degrees of that scale.
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