Beats was purchased shortly thereafter by Apple and Saint John became the head of global consumer marketing for iTunes and Apple Music, commuting between Los Angeles and Apple's Cupertino headquarters several times a week. Journalists described Saint John's presentation of the redesigned Apple Music onstage during the 2016 Apple Worldwide Developers Conference as her breakthrough moment, with a captivating "passion" and persona that captivated both local and online audiences. Biz Carson of Business Insider said that her appearance helped to emphasize Apple's complete rebuild of its Apple Music software. For instance, she attempted to have the audience sing along with on-screen lyrics, a feature in the redesigned app. Buzzfeed wrote that she was the "coolest" person to ever take the stage at an Apple keynote.

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