400! 400! We have reached 400 episodes. Holy cow. How did we do that. And what better way to celebrate it than with Mark Ronson - one of the greatest music producers in the world and now a composer of score. Mark joined me after I messaged him out of the blue to discuss his music for Barbie. What a legend. With no compulsion from a PR company, Mark gave Edith, and by proxy you, half an hour of his time to talk about Greta Gerwigs’s brilliant film.