What key to use for a certain meaning or theme in the song?
I know this might be considered a very vague question, but I don't know where else to go. I've started songwriting recently and I'm still a beginner. I was wondering, what key(s) should I write my song in, in order to express a certain viewpoint? For instance, I'm writing a song about wealth and industrialization and the cruelties that come along with it. In this case, what keys should I use to express my theme topic? What chords should I use in my chord progression? Should I use major, minor, diminished, or other chords and scales?