What does it take to star as Elphaba on Broadway? As Mary Kate (MK) reveals, it is not for the faint of heart! From her vocal health non-negotiables, to who makes up her voice and self-care team, we're talking all the nitty gritty of her routine and mindset in order to play one of the toughest roles on Broadway. "I have learned all of this from failing," she says. In this interview and the day-in-the-life content she regularly shares on social media, it is a gift to learn from and observe som...