Sad music has the same melodies someone might have if they were sad and talking, and same with happy music. If some musical melody sounds bad, It's probably because it's going against how you'd expect someone to talk. I wonder if there is any insight to be found for musical composition in the field of phonetics?
of course. bring the phonetics in from the field, if possible. lay them on the desk right in front of you, while you work. bathe in phonetics