Sound Idea

So, I've just come up with a potential idea that I can use in tomorrow's final edit. We were told that we shouldn't use different fonts for different characters because "you wouldn't see that in an actual film", therefore, I came up with the idea of using the music/sound. Different characters would be portrayed by different sounds/music, for example, 'the Hoodrat' would have minor/dark, urban music play when he's seen in the shot, then when he's not, the music returns back to normal. This, I feel, would be an interesting idea to play around with, in order to make a really good film.