Rivalry isn't one of the seven deadly sins-but perhaps it should be the unofficial eighth. In the Redefining Rivalries podcast, sponsor generated content for Billions on SHOWTIME, produced by WSJ Custom Studios, a unit of the advertising department of The Wall Street Journal, the intricacies and impact of competition will be explored in four distinct areas. On this episode, we'll delve into the world of classical music, where an ongoing battle of the sexes is shattering the glass ceiling-or should we call it the glass podium-for female conductors.