I feel that this article convincingly makes the case that women are vastly underrepresented in songwriting of top hits.

That said, I feel like I have little to no insight into how songwriting works as an industry. Who chooses songwriters for a headline act? How much say do the performers have? What ostensibly motivates the choices of whoever chooses?

The conclusion implicit throughout the article (made explicit at the end) is that this data is the result of bias, and I suspect that's probably right. But I'd love to hear more about where and how that actually happens.