Authors:

In country and R&B, there's much more of that division between writers and performers, and that's where you see more of those [crossover] songs, but you don't get a lot of that coming out of the more pop and rock side of things.

Source: pitchfork.com
In country and R&B, there's much more of that division between writers and performers, and that's where you see more of those [crossover] songs, but you don't get a lot of that coming out of the more pop and rock side