UK & US
The cultural diversity that exists in both these countries seems to be the relationship that makes them so comparable. The different cultures within these two countries are each creating their own form of hip hop individually. The effect of multi-cultural countries on music seems to be cross collaboration with the end result being a blending of all the different cultures. This merging of music puts the resultant hip hop from both the US and the UK on the top of the charts.
Read more about this topic: British Hip Hop