Hmm,...I'm always undecided about how to rate 3rd party music. Feels a bit strange to favor some cool 3rd party music over some crappy music made by the developer..... 

I've frequently wondered what happens to games like mine that use sound effects and music automatically generated by the game library.

(Translated from Japanese by DeepL)

I guess you could give points for well chosen music that fits the game, and extra points if it's made by de developer. So really awsome and well chosen music could be 4 points, and okay  music made by the  developer themselves, also 4 points, and maybe 5 points for great music made by the dev specifically for this game? 
It's the same with graphics and other assets I suppose.