A few years ago, when I started doing what I was trying to do, I heard about it, read it, or picked it up somewhere. I did not know how and where.
Each tone of voice expresses something else, it was not about emotions that are triggered or felt. But about how it should sound.
F / f for happy, D / d for dramatic, E / e for epic etc.
I tried to find answers on the internet, but the only thing I could find out was.
For most people, minor has a rather melancholy effect, they add a dark sound to a piece in minor. On the other hand, Dur is often described by most people as radiant or happy.
By accident, I once heard in a documentary Paul McCartney say to other musicians, let's play the song again but this time in a / A that is more driving. I do not know if it was in minor or major.
What can I say, I compared it and it's true.
If Paul McCartney is right, and I do not fancy it all, which I do not believe, then I hope to find answers here.