Fans roared in excitement and organizers sighed with relief as the Tomorrowland music festival kicked off Friday — two days after a massive fire engulfed the main stage and threw one of Europe's biggest summer concert events into doubt.

Thousands of dance music fans are enjoying the Tomorrowland festival in Belgium this weekend after heavy metal heroes Metallica stepped in to save the event from cancellation. The main stage for the huge EDM event in the town of Boom in Belgium's Antwerp province was decimated by fire this week, just days before the gates were due to open.