A federal jury has ruled that live entertainment behemoth Live Nation Entertainment and its ticketing subsidiary, Ticketmaster, operate as an illegal monopoly, a landmark decision that could permanently reshape the multibillion-dollar live music industry. The sweeping April 15 verdict caps off a dramatic legal saga that fractured a unified government front and pushed a coalition of states to take the entertainment giant to trial on their own. The jury’s decision formally vali

The average price of a concert ticket has nearly doubled in the last decade — and no company is more deeply embedded in that change than...