Hans Zimmer is a highly accomplished composer who has created the music for such films like Inception, The Lion King, Gladiator, The Dark Knight, and much more. If you need a little reminder then listen to "Time", a musical masterpiece created for Inception:
Tomorrowland came up with a great idea to let Hans Zimmer create a 10 minute Tomorrowland Hymn in celebration of its 10th year anniversary. Here's the promo video:
Can't wait to hear the results!