They have to represent a different ethos a different region of affect, but not be from totally different universes.
The song I most hate hearing buskers do is hallelujah I hate that song anyway whoever does it but it's particularly bad when buskers do it.
feel for you is music of earth, ain't nobody is music of the heavens. feel for you operates as rom com, ain't nobody as myth.
Corpsey your homework is to set another of these civil wars up. Find the perfect pair of songs. I want it on my desk by 3pm.
All the buskers in South Wales caterwaul like Sheeran now. Imagine that being the peak of your aesthetic aspiration.