Even if you don’t know her name, there is a high probability that you will have wailed along, pogoed, or air-drummed wildly to one of the records Catherine Marks has been involved with. PJ Harvey, St. Vincent, Foals, Radiohead’s Ed O’Brien—since a chance meeting with super-producer Flood sparked her career, this Melbourne-born, London-based mixer and sound engineer has cultivated a stable of associated acts that runs like a Mount Rushmore of rock’s most innovative artists. Striking out on her own as a producer has brought even richer rewards. Her work with Reading hellraisers The Amazons is coloured by the crisp, mountainous riffs that have become something of a Marks signature. And then there’s The Big Moon’s “Cupid” (part of her Mercury-nominated assist on the album Love in the 4th Dimension)—a fizzing eruption of cascading percussion, helter-skelter harmonies, and freewheeling attitude.