Britney Spears' latest Instagram video sent Ricki and Tim down a pop music rabbit hole that ended with a deep dive into legendary hitmaker Max Martin. From Britney Spears and the Backstreet Boys to Pink, Taylor Swift, Katy Perry and The Weeknd, they unpacked how one songwriter helped create some of the biggest songs ever recorded. Plus, Tim attempted to explain the bizarre "music math" theory behind massive global hits, while Ricki realised just how many of her favourite songs had the same mastermind behind them.

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