Video: How Eric Whitacre conducted his virtual choir of 2,000 voices

With an emergent technology, something happens that you’d never imagined. Here, YouTube and Hulu, via WordPress, Facebook, and Twitter — and built upon the Internet — bring something new and wonderful to life.

In a moving, madly viral video last year, composer Eric Whitacre led a virtual choir of singers from around the world. He talks through the creative challenges of making music powered by YouTube, and unveils the first 2 minutes of his new work, “Sleep.”