A virtual choir 2,000 voices strong: Eric Whitacre on

In a moving and 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,” with a video choir of 2,052. (Recorded at TED2011, March 2011, in Long Beach, CA. Duration: 14:35)

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NEW: Watch the full performance of “Sleep” >>