Let me show you an example:
Here is the iconic album "What's Going On" featuring Marvin Gaye making a statement about racial segregation and mistreatment. The message is positive because it is constructively asking a question and seeking conversation vs conflict. The music itself is beautiful and inspiring with a wonderful vocal by a truly talented man.
https://www.youtube.com/watch?v=Biw4kWxqt0o
Now compare this to NWA - Straight Outta Compton which features the same message of racial segregation and mistreatment but it is presented in a very violent and aggressive tone promoting violence instead of seeking a real solution to the problem.
https://www.youtube.com/watch?v=nBBno3jf7-E
Same ideas being presented but the delivery is vastly different. Therefore my statement of positive and enlightening music still stands.