A music lover since the day I was born … and I’ve heard it all … I’ve never heard any ‘dark music’ per se. If by music you mean music with lyrics, that’s different.

There’s no such thing as a ‘musical shadow’. Jung’s ‘Shadow’ consists of psychological parts (‘garbage pit’) you’re not aware of because you’re hiding them from consciousness (for various reasons). What ‘you consider’ isn’t a part of it.