(I know very BASIC theory so I'm hoping there are some music/music theory nerds out here that can help figure this out. Is it even possible to stack something on top of a minor scale/key that will help it sound 'happy'? (Person I'm helping doesn't know music theory, so all I have to go off of is 'happy' & 'sad'.) In my head, once the key is picked, you can't really add on top of that to change the tone/feeling, but I really don't have a clue what I'm talking about when it comes to theory. I know that the relative major is Bb Major (harmonic), but that doesn't really do any good because it's just the same notes in a different order. My question is: is there a way to overlay something on top of G harmonic minor that would 'lighten it up'?
So I have been tasked with trying to write a thing over a backing track written in G minor (scale is harmonic), and I have been asked if there was a way to make it sound 'less dark'.